Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2017	Feb. 01, 2018	Jun. 30, 2017
Document Information [Line Items]
Entity Registrant Name	Ultralife Corp
Entity Central Index Key	0000875657
Trading Symbol	ulbi
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		15,653,649
Entity Public Float			$ 69,474,629
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash	$ 18,241	$ 10,629
Restricted Cash	89	77
Trade Accounts Receivable, Net of Allowance for Doubtful Accounts of $292 and $277, Respectively	14,657	13,179
Inventories, Net	26,326	23,456
Prepaid Expenses and Other Current Assets	2,603	2,079
Total Current Assets	61,916	49,420
Property, Equipment and Improvements, Net	7,570	7,999
Goodwill	20,458	19,965
Other Intangible Assets, Net	7,085	7,194
Deferred Income Taxes	32	94
Security Deposits and Other Non-Current Assets	125	72
Total Assets	97,186	84,744
Current Liabilities:
Accounts Payable	8,787	7,292
Accrued Compensation and Related Benefits	2,413	1,258
Accrued Expenses and Other Current Liabilities	2,871	2,606
Income Taxes Payable	168	172
Total Current Liabilities	14,239	11,328
Deferred Income Taxes	3,867	5,538
Other Non-Current Liabilities	31	18
Total Liabilities	18,137	16,884
Commitments and Contingencies (Note 7)
Shareholders' Equity:
Preferred Stock – Par Value $.10 Per Share; Authorized 1,000,000 Shares; None Issued
Common Stock – Par Value $.10 Per Share; Authorized 40,000,000 Shares;Issued – 19,670,928 Shares and 19,324,723 Shares, Respectively; Outstanding – 15,651,217 Shares and 15,308,971 Shares, Respectively	1,966	1,932
Capital in Excess of Par Value	180,211	178,163
Accumulated Deficit	(82,894)	(90,542)
Accumulated Other Comprehensive Loss	(1,611)	(3,080)
Treasury Stock - at Cost; 4,019,711 Shares and 4,015,752 Shares at December 31, 2017 and 2016, respectively	(18,469)	(18,443)
Total Ultralife Corporation Equity	79,203	68,030
Non-Controlling Interest	(154)	(170)
Total Shareholders’ Equity	79,049	67,860
Total Liabilities and Shareholders' Equity	$ 97,186	$ 84,744

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Trade accounts receivable, allowance for doubtful accounts	$ 292	$ 277
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	19,670,928	19,324,723
Common stock, shares outstanding (in shares)	15,651,217	15,308,971
Treasury stock, shares (in shares)	4,019,711	4,015,752

Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 85,531	$ 82,460
Cost of Products Sold	59,299	57,352
Gross Profit	26,232	25,108
Operating Expenses:
Research and Development	4,737	5,946
Selling, General and Administrative	15,019	15,399
Total Operating Expenses	19,756	21,345
Operating Income	6,476	3,763
Other Expense (Income):
Interest and Financing Expense	183	263
Miscellaneous	(2)	(80)
Income Before Income Taxes	6,295	3,580
Income Tax (Benefit) Provision	(1,369)	98
Net Income	7,664	3,482
Net Income (Loss) Attributable to Non-Controlling Interest	16	(27)
Net Income Attributable to Ultralife Corporation	7,648	3,509
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	1,469	(2,173)
Comprehensive Income Attributable to Ultralife Corporation	$ 9,117	$ 1,336
Net Income Per Share Attributable to Ultralife Corporation Common Shareholders – Basic: (in dollars per share)	$ 0.49	$ 0.23
Net Income Per Share Attributable to Ultralife Corporation Common Shareholders – Diluted: (in dollars per share)	$ 0.48	$ 0.23
Weighted Average Shares Outstanding – Basic (in shares)	15,528	15,261
Weighted Average Shares Outstanding – Diluted (in shares)	15,858	15,405

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2015	19,181,815
Balance at Dec. 31, 2015	$ 1,918	$ 177,007	$ (907)	$ (94,051)	$ (17,808)	$ (143)	$ 66,016
Purchases of Stock					(635)		(635)
Vesting of Restricted Shares (in shares)	15,900
Vesting of Restricted Shares	$ 2	(2)
Stock Option Exercises (in shares)	127,008						152,789
Stock Option Exercises	$ 12	448					$ 460
Stock-Based Compensation - Stock Options		676					676
Restricted Stock		34					34
Foreign Currency Translation Adjustments			(2,173)				(2,173)
Net Income				3,509		(27)	$ 3,482
Balance (in shares) at Dec. 31, 2016	19,324,723						15,308,971
Balance at Dec. 31, 2016	$ 1,932	178,163	(3,080)	(90,542)	(18,443)	(170)	$ 67,860
Purchases of Stock					(26)		$ (26)
Vesting of Restricted Shares (in shares)	12,900
Vesting of Restricted Shares	$ 1	(1)
Stock Option Exercises (in shares)	333,305						333,305
Stock Option Exercises	$ 33	1,396					$ 1,429
Stock-Based Compensation - Stock Options		642					642
Restricted Stock		11					11
Foreign Currency Translation Adjustments			1,469				1,469
Net Income				7,648		16	$ 7,664
Balance (in shares) at Dec. 31, 2017	19,670,928						15,651,217
Balance at Dec. 31, 2017	$ 1,966	$ 180,211	$ (1,611)	$ (82,894)	$ (18,469)	$ (154)	$ 79,049

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES:
Net Income	$ 7,664	$ 3,482
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	2,005	2,223
Amortization of Intangible Assets	422	503
Amortization of Financing Fees	52	71
Stock-Based Compensation	653	710
Loss on Long-Lived Asset Disposals		29
Deferred Income Tax Expense	(1,669)	135
Provision for allowance for doubtful accounts	(5)	(24)
Changes in operating assets and liabilities:
Accounts Receivable	(1,295)	(667)
Inventories	(2,537)	1,981
Prepaid Expenses and Other Assets	(673)	730
Income taxes receivable and payable	(8)	(158)
Accounts Payable and Other Liabilities	2,661	(1,362)
Net Cash Provided by Operating Activities	7,270	7,653
INVESTING ACTIVITIES:
Cash Paid for Property, Equipment and Improvements	(1,392)	(1,219)
Acquisition of Accutronics, Net of Cash Acquired		(9,857)
Net Cash Used in Investing Activities	(1,392)	(11,076)
FINANCING ACTIVITIES:
Proceeds from Exercise of Stock Options	1,429	460
Tax Withholdings on Stock-Based Awards	(26)	(28)
Cash Paid to Repurchase Treasury Stock		(607)
Proceeds from Debt Borrowings		3,030
Payments of Debt Borrowings		(3,030)
Net Cash Provided by (Used in) Financing Activities	1,403	(175)
Effect of Exchange Rate Changes on Cash	331	(166)
INCREASE (DECREASE) IN CASH	7,612	(3,764)
Cash, Beginning of Year	10,629	14,393
Cash, End of Year	18,241	10,629
Supplemental Cash Flow Information:
Construction in Process in Accounts Payable	87	83
Income Taxes Paid	345	273
Interest Paid	$ 102	$ 179

Note 1 - Summary of Operations and Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Business Description and Accounting Policies [Text Block]

Note

- Summary of Operations and Significant Accounting Policies

a .	Description of Business

As used in this annual report, unless otherwise indicated, the terms “we”, “our” and “us” refer to Ultralife Corporation (“Ultralife”) and includes our wholly-owned subsidiaries, ABLE New Energy Co.

, Limited and its wholly-owned subsidiary ABLE New Energy Co.; Ltd; Ultralife UK LTD and its wholly-owned subsidiary, Accutronics Ltd; Ultralife Batteries (UK) Ltd.; and our majority-owned joint venture Ultralife Batteries India Private Limited.

We offer products and services ranging from power solutions to communications and electronics systems. Through our engineering and collaborative approach to problem solving, we serve government, defense and commercial customers across the globe. We design, manufacture, install and maintain power and communications systems including: rechargeable and non-rechargeable batteries, charging systems, communications and electronics systems and accessories, and custom engineered systems.

We sell our products worldwide through a variety of trade channels, including original equipment manufacturers (“OEMs”), industrial and defense supply distributors, and directly to U.S. and international defense departments.

b.	Principles of Consolidation

The consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and include the accounts of Ultralife Corporation, our wholly-owned subsidiaries

, Ultralife Batteries (UK) Ltd., Ultralife UK LTD, and its wholly-owned subsidiary Accutronics Ltd, ABLE New Energy Co., Limited, and its wholly-owned subsidiary ABLE New Energy Co., Ltd. (“ABLE” collectively), and our majority-owned subsidiary Ultralife Batteries India Private Limited (“India JV”). Intercompany accounts and transactions have been eliminated in consolidation.

c.	Management's Use of Judgment and Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at year end and the reported amounts of revenues and expenses during the reporting period. Key areas affected by estimates include: (a) carrying value of goodwill and intangible assets; (b) reserves for deferred tax assets, excess and obsolete inventory, warranties, and bad debts; (c)

valuation of assets acquired and liabilities assumed in business combinations; (d) various expense accruals; and (e) stock-based compensation. Our actual results could differ from these estimates.

d.	Reclassifications

Certain items previously reported in specific financial statement captions

are reclassified to conform to the current presentation. There were

material reclassifications for the years ended

December 31, 2017

and

2016.

Cash

Our cash balances

may

at times exceed federally insured limits.

We have

not

experienced any losses in these accounts and believe we are

not

exposed to any significant risk with respect to cash.

f.	Accounts Receivable and Allowance for Doubtful Accounts

We extend credit to our customers in the normal course of business. We perform ongoing credit evaluations and generally do

not

require collateral. Trade accounts receivable are recorded at their invoiced amounts, net of allowance for doubtful accounts. We evaluate the adequacy of our allowance for doubtful accounts quarterly. Accounts outstanding longer than contractual payment terms are considered past due and are reviewed individually for collectability. We maintain reserves for potential credit losses based upon our loss history and specific receivables aging analysis. Receivable balances are written off when collection is deemed unlikely.

Allowance for doubtful accounts was

$292

and

$277

for the years ended

December 31, 2017

and

2016,

respectively.

g.	Inventories

Inventories are stated at the lower of cost or net realizable value with cost determined under the

first

-in,

first

-out (FIFO) method. We record provisions for excess, obsolete or slow-moving inventory based on changes in customer demand, technology developments or other economic factors.

h.	Property, Plant and Equipment

Property, plant and equipment are stated at cost.

Depreciation and amortization are computed using the straight-line method over the estimated useful lives. Estimated useful lives are as follows (in years):

Building s	1 0	–	2 0
Machinery and Equipmen t	5	–	1 0
Furniture and Fixture s	3	–	1 0
Computer Hardware and Softwar e	3	–	5
Leasehold Improvement s	Lesser of useful life or lease ter m

Betterments, renewals and extraordinary repairs that extend the life of the assets are capitalized. Other repairs and maintenance costs are expensed when incurred. When disposed, the cost and accumulated depreciation applicable to assets retired are removed from the accounts and the gain or loss on disposition is recognized in operating income.

i.	Long-Lived Assets, Goodwill and Intangibles

We assess all of our long-lived assets for impairment when events or circumstances indicate that their carrying amounts

may

not

be recoverable. For property, plant and equipment and amortizable intangible assets, this is accomplished by comparing the expected undiscounted future cash flows of the assets with the respective carrying amount as of the date of assessment. Should aggregate future cash flows be less than the carrying value, a write-down would be required, measured as the difference between the carrying value and the fair value of the asset. Fair value is estimated as the present value of expected discounted future cash flows. The discount rate used by us in our evaluation

is an industry-based weighted average cost of capital. If the expected undiscounted future cash flows exceed the respective carrying amount as of the date of assessment,

impairment is recognized.

The purchase price paid to effect an acquisition is allocated to the acquired tangible and intangible assets and liabilities at fair value. We do

not

amortize goodwill and intangible assets with indefinite lives, but instead evaluate these assets for impa

irment at least annually, or when events indicate that impairment exists. We amortize intangible assets that have definite lives so that the economic benefits of the intangible assets are being utilized over their weighted-average estimated useful life.

The quantitative impairment test for goodwill consists of a comparison of the fair value of the reporting unit with the carrying amount of the reporting unit to which it is assigned.

If the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered

not

impaired. If the carrying amount of a reporting unit exceeds its fair value, a

second

step of the goodwill impairment test is performed to measure the amount of impairment loss, if any. The impairment test for intangible assets with indefinite lives consists of a comparison of the fair value of the intangible assets with their carrying amounts. If the carrying value of the intangible assets exceeds the fair value, an impairment loss is recognized in an amount equal to that excess.

j.	Translation of Foreign Currency

The financial statements of our foreign subsidiaries are translated

from the functional currency into U.S. dollar equivalents, with translation adjustments recorded as the sole component of accumulated other comprehensive loss on the balance sheets. Exchange gains and (losses) relate to foreign currency transactions and balances denominated in currencies other than the functional currency included in net income for the years ended

December 31, 2017

and

2016

were $(

) and

$86,

respectively.

k .	Revenue Recognition

Product Sales

– In general, revenues from the sale of products are recognized when products are shipped. When products are shipped with terms that require transfer of title upon delivery at a customer’s location, revenues are recognized on the date of delivery. We will make a provision at the time the revenue is recognized for warranty costs expected to be incurred. Customers, including distributors, do

not

have a general right of return on products shipped.

For products shipped under vendor managed inventory arrangements, revenue is recognized when the product is consumed by the customer, at which point title has transferred and there are

further obligations by the Company.

Deferred Revenue

–

For each source of revenues, we defer recognition if: (i) evidence of an agreement does

not

exist,( ii) delivery or service has

not

occurred, (iii) the selling price is

not

fixed or determinable, or (iv) collectability is

not

reasonably assured.

l.	Warranty Reserves

We estimate future costs associated with expected product failure rates, material usage and service costs in the development of our warranty obligations. Warranty reserves, included in other current liabilities and other long-term liabilities as applicable on our Consolidated Balance Sheets, are based on historical experience of warranty claims. In the event the actual results of these items differ from the estimates, an adjustment to the warranty obligation would be recorded.

m.	Shipping and Handling Costs

Costs incurred by us related to shipping and handling are included in cost of products sold. Amounts charged to customers pertaining to these costs are reflected as revenue.

n.	Advertising Expenses

Advertising costs are expensed as incurred and are included in selling, general and administrative expenses in the accompanying Consolidated Statements of

Income and Comprehensive Income. Such expenses amounted to

$26

and

$32

for the years ended

December 31, 2017

and

2016,

respectively.

o.	Research and Development

Research and development expenditures are charged to operations as incurred. The majority of research and development expenses pertain to salaries and benefits, developmental supplies, depreciation and other contracted services. During

201

and

2016,

we expended

$5,142

and

$6,155,

respectively, on research and development, including

$405

and

$209,

respectively, on customer sponsored research and development activities, which are included in cost of goods sold. We recognized

$405

and

$209

of revenue relating to these activities during

2017

and

2016,

respectively.

p.	Environmental Costs

Environmental expenditures that relate to current operations are expensed. Remediation costs that relate to an existing condition

caused by past operations are accrued when it is probable that these costs will be incurred and can be reasonably estimated.

q.	Income Taxes

We account for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that are expected to be in effect when the differences are expected to reverse.

A valuation allowance is required when it is more likely than

not

that the recorded value of a deferred tax asset will

not

be realized. As of Decem

ber

31,

2017,

we continued to recognize a valuation allowance in the U.S. and certain U.K. operations on our net deferred tax assets to the extent that temporary tax differences and the U.S. and U.K. net operating loss and tax credit carryforwards resulting in the deferred tax asset are

not

able to be offset by future reversing temporary differences. The assessment of the realizability of the U.S. NOL was based on a number of historical factors including, our history of net operating losses prior to

2015,

our historical operating volatility, our historical inability to accurately forecast earnings for future periods, and the continued uncertainty of the general business climate as of the end of

2017.

We concluded that these historical factors represent sufficient negative evidence and have concluded that we should record a full valuation allowance against these net deferred tax assets. We also recorded a full valuation allowance on our net deferred tax asset for the year ended

December 31, 2016.

r.	Concentration Related to Customers and Suppliers

During t

he year ended

December 31, 2017,

we had

one

major customer, a large defense primary contractor, which comprised

18%

and

12%

of our revenues in

2017

and

2016,

respectively. During the year ended

December 31, 2016,

another large defense primary contractor comprised

13%

of our sales; however, sales to this customer in

2017

comprised

of our sales. There were

other customers that comprised greater than

10%

of our total revenues during these years.

Currently, we do

not

experience significant seasonal trends in our revenues. Since a significant portion of our revenues are based on purchases from U.S. and allied country defense departments, the timing of our sales could be impacted by delays in the government budget process and the decisions to deploy resources to support military purchases of our products.

We generally do

not

distribute our products to a concentrated geographical area nor is there a significant concentration of credit risks arising from individuals or groups of customers engaged in similar activities, or who have similar economic characteristics. While direct and indirect sales to the U.S. Department of Defense

have been substantial during

2017

and

2016,

we do

not

consider this customer to be a significant credit risk. We do

not

normally obtain collateral on trade accounts receivable.

Certain materials and components used in our products are available only from a single or a limited number of suppliers. As such, some materials and components could become in short supply resulting in limited availability and/or increased costs. Additionally, we

may

elect to develop relationships with a single or limited number of suppliers for materials and components that are otherwise generally available.

Although we believe that alternative suppliers are available to supply materials and components that could replace materials and components currently used and that, if necessary, we would be able to redesign our products to make use of such alternatives, any interruption in the supply from any supplier that serves as a sole source could delay product shipments and have a material adverse effect on our business, financial condition and results of operations. We have experienced interruptions of product deliveries by sole source suppliers in the past.

s.	Fair Value Measurements and Disclosures

Fair value is defined as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date.

Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into

three

levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level

Quoted prices in active markets for identical assets or liabilities.

Level

Observable inputs, other than Level

prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are

not

active; or other inputs that are observable or that we corroborate with observable market data for substantially the full term of the related assets or liabilities.

Level

Unobservable inputs supported by little or

market activity that are significant to the fair value of the assets or liabilities.

The fair value of financial instruments approximated their carrying values at

December 31, 2017 and 2016.

The fair value of cash, trade accounts receivable, trade accounts payable, and accrued liabilities approximates carrying value due to the short-term nature of these instruments.

t.	Earnings Per Share

Basic earnings per share is computed by dividing net income or loss

attributable to Ultralife Corporation by the weighted average number of common shares outstanding for the period. Diluted earnings per share calculations reflect the assumed exercise and conversion of dilutive employee stock options and unvested restricted stock, if any, applying the treasury stock method. Diluted earnings per share in

2017

include

1,035,711

outstanding in-the-money stock options that add

330,676

shares to the number of shares outstanding. Diluted earnings per share in

2016

include

1,238,804

outstanding in-the-money stock options that add

135,458

shares to the number of shares outstanding, and include

15,900

restricted stock units that add

9,538

shares outstanding. There were

unvested restricted stock units as of

December 31, 2017.

Diluted earnings per share calculations exclu

de the effect of

824,500

and

1,332,281

employee stock options in

2017

and

2016,

respectively, as such options have an exercise price in excess of the weighted average market price of the Company’s common stock.

u.	Stock-Based Compensation

We have various stock-based employee compensation plans

that are described more fully in Note

The compensation cost relating to share-based payment transactions is measured at the grant date, based on the estimated fair value of the award, and is recognized as expense over the employee’s requisite service period (generally the vesting period of the equity award).

v.	Segment Reporting

We have

two

operating segments

– Battery & Energy Products, and Communications Systems. The basis for determining our operating segments is the manner in which financial information is used in monitoring our operations. Management operates and organizes itself according to business units that comprise unique products and services across geographic locations.

w.	Recent Accounting Pronouncements

November 2015,

the Financial Accounting Standards Board (“

FASB”) issued Accounting Standards Update (“ASU”)

2015

17,

“Income Taxes: Balance Sheet Classification of Deferred Taxes”, which requires that deferred tax liabilities and assets be netted against each other and classified as non-current in a classified statement of financial position. ASU

2015

is effective for public companies for annual and interim periods beginning after

December

15,

2016.

During the

first

quarter of

2017,

we adopted ASU

2015

on a retrospective basis. As such, we reclassified

$32

and

$94

of foreign current deferred tax assets to non-current on the consolidated balance sheets as of

December 31, 2017

and

2016,

respectively. The deferred tax liabilities relate to U.S. tax obligations which cannot be netted against foreign deferred taxes. The adoption of ASU

2015

did

not

affect our consolidated statements of income.

March 2016,

the FASB issued ASU

2016

09,

“

Compensation – Stock Compensation (Topic

718

)”, which identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. ASU

2016

is effective for public companies for annual and interim periods beginning after

December

15,

2016.

We adopted the new accounting standard in the

first

quarter of

2017

and will maintain our policy to estimate forfeitures expected to occur to determine stock-based compensation expense. Adoption of this new accounting standard resulted in the recognition of an increase in the Company’s gross deferred tax asset of

$1,123

and an offsetting increase in the valuation allowance. There was

impact to the Company’s retained earnings as a result of adopting this new accounting standard.

July 2015,

the FASB issued ASU

2015

11,

"Simp

lifying the Measurement of Inventory," which simplifies the subsequent measurement of inventory by using only the lower of cost and net realizable value. This standard is effective for fiscal years and interim periods within those years beginning after

December 15, 2016,

and must be applied on a retrospective basis. We adopted the new accounting standard in the

first

quarter of

2017.

There was

material impact to the Company's financial statements as a result of adopting this new accounting standard.

May 2014,

the Financial Accounting Standards Board (

“FASB”) issued Accounting Standards Update

No.

2014

(Topic

606

) “Revenue from Contracts with Customer” related to revenue from contracts with customers. Under this standard, revenue is recognized when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The updated standard will replace most existing revenue recognition guidance under GAAP and permits the use of either the retrospective or cumulative effect transition method. Topic

606

is effective for annual reporting periods beginning after

December 15, 2017,

including interim periods within that reporting period. The company will adopt Topic

606

effective

January 1, 2018.

Topic

606

will

not

have a material impact on our Consolidated Financial Statements.

February 2016,

the

FASB issued Accounting Standards Update

No.

2016

02,

“Leases” requires that lessees recognize a right-to-use asset and related lease liability for all significant financing and operating leases

not

considered short-term leases, and specifies where in the statement of cash flows the related lease payments are to be presented. The guidance is effective for years beginning after

December 15, 2018

and early adoption is permitted. The Company has

not

yet determined the impact of this standard on our Consolidated Financial Statements, but believes it

may

be significant. We have elected

not

to adopt this standard in advance of its required effective date.

October 2016,

the FASB issued

Accounting Standards Update

No.

2016

16,

“Income Taxes (Topic

740

), Intra-Entity Transfers of Assets Other Than Inventory”. The new guidance requires that entities recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when the asset is sold to an outside party. The guidance is effective for annual reporting periods beginning after

December 15, 2017,

including interim periods within those annual reporting periods. Early adoption is permitted. The new guidance requires adoption on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The company will adopt Topic

740

effective

January 1, 2018.

Topic

740

will

not

have a material impact on our Consolidated Financial Statements.

August 2016,

the FASB issued

Accounting Standards Update

No.

2016

15,

“Statement of Cash Flows (Topic

230

), Classification of Certain Cash Receipts and Cash Payments”. The new guidance makes

eight

targeted changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The guidance is effective for fiscal years beginning after

December 15, 2017,

and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The new guidance requires adoption on a retrospective basis unless it is impracticable to apply, in which case the company would be required to apply the amendments prospectively as of the earliest date practicable. The Company will adopt this standard effective

January 1, 2018.

This standard will

not

have a material impact on our Consolidated Financial Statements.

January 2017,

the FASB issued ASU

2017

04,

“

Intangibles – Goodwill and Other (Topic

350

) – Simplifying the Test for Goodwill Impairment”, which eliminates the

two

-step process that required identification of potential impairment and a separate measure of the actual impairment. The annual assessment of goodwill impairment will be determined by using the difference between the carrying amount and the fair value of the reporting unit. The Company is currently assessing the impact that adopting this new accounting standard will have on our Consolidated Financial Statements.

May 2017,

the FASB issued ASU

2017

09,

“

Compensation – Stock Compensation (Topic

718

) – Scope of Modification Accounting”, which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic

718.

ASU

2017

is effective for fiscal years beginning after

December 15, 2017

and interim periods within those fiscal years, and early adoption is permitted, including in an interim period. ASU

2017

is to be applied on a prospective basis to an award modified on or after the adoption date. We do

not

intend to early adopt ASU

2017

and do

not

expect the adoption of this new accounting standard will have a material impact on our Consolidated Financial Statements.

Note 2 - Acquisition

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Mergers, Acquisitions and Dispositions Disclosures [Text Block]

Note

– Acquisition

January 13, 2016,

Ultralife UK Limited (the “Merger Subsidiary”), a U.K. corporation and a wholly-owned subsidiary of Ultralife Corporation (the “Company”),

completed the acquisition of all of the outstanding ordinary shares of Accutronics Limited (“Accutronics”), a U.K. corporation based in Newcastle-under-Lyme, U.K., from Intrinsic Equity Limited, Catapult Growth Fund Limited Partnership, MJF Pension Trustees Limited, Robert Andrew Phillips and Michael Allen (collectively, the “Sellers”). There are

material relationships between the Company or Merger Subsidiary and any of the Sellers, other than pertaining to this acquisition. Accutronics is a leading independent designer and manufacturer of smart batteries and charger systems for high-performance, feature-laden portable and handheld electronic devices and is classified in the Battery & Energy Products segment. The acquisition of Accutronics advances our strategy of commercial revenue diversification and expands our geographic reach within European OEM’s. With industry experts predicting mid-to-high single digit growth in the global medical batteries market, this strategic investment positions Ultralife well for further penetration of and growing revenue streams from an attractive commercial market.

The acquisition was completed pursuant to the terms of the Share Purchase Agreement dated

January 13, 2016

by and among the Merger Subsidiary and the Sellers. The Merger Subsidiary paid at the time of closing an aggregate purchase price of

£7,575

(

$10,976

) in cash, and in exchange the Merger Subsidiary received all of the outstanding shares of Accutronics ordinary stock. Monies to fund the purchase price were advanced to the Merger Subsidiary from the Company

’s general corporate funds.

The purchase price was subject to adjustment based on

the difference between actual and estimated amounts of working capital of Accutronics as well as the amount of net cash of Accutronics. The adjustment resulted in a final payment to the Sellers in the amount of

£133

February 24, 2016,

bringing the total aggregate purchase price to

£7,708

(

$11,161

The purchase price allocation was determined in accordance with the accounting treatment of a business combination in Financial Accounting Standards Board (“FASB”) ASC Topic

805,

Business Combinations

. Under the guidance, the fair value of the consideration was determined and the assets acquired and liabilities assumed have been recorded at their fair values at the date of the acquisition. The excess of the consideration paid over the estimated fair values has been recorded as goodwill.

The allocation of purchase price to the assets acquired and liabilities assumed at the date of the acquisition is presented in the table below (in thousands). Management is responsible for determining the fair value of the tangible and intangible assets acquired and liabilities assumed as of the date of acquisition. Management considered a number of factors, including reference to an analysis performed under FASB ASC Topic

805

solely for the purpose of allocating the purchase price to the assets acquired and liabilities assumed. The Company

’s estimates are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable. These valuations require the use of management’s assumptions, which would

not

reflect unanticipated events and circumstances that occur. The originally reported purchase price allocation has been updated based on information obtained about facts and circumstances that existed as of the acquisition date. As a result, adjustments were made which reduced identifiable intangible assets and property, plant and equipment by

$402

and

$99,

respectively, and increased prepaids and other current assets, inventory, deferred income taxes on intangible assets and goodwill by

$291,

$75,

$113

and

$104,

respectively.

Cas h	$	1,304
Accounts Receivabl e		1,344
Inventor y		2,167
Prepaids and Other Current Asset s		584
Property, Plant & Equipmen t		269
Identifiable Intangible Asset s		4,374
Goodwil l		4,487
Accounts Payabl e		(1,009	)
Accrued Expense s		(1,136	)
Income Taxes Payabl e		(111	)
Non-Current Liabilitie s		(209	)
Deferred Income Taxe s		(74	)
Deferred Income Taxes on Intangible Asset s		(829	)

Total Consideratio n	$	11,161

The goodwill included in the Company

’s purchase price allocation presented above represents the value of Accutronics assembled and trained workforce, the incremental value that Accutronics engineering and technology will bring to the Company and the revenue growth expected to occur over time attributable to increased market penetration from future new products and customers. The goodwill acquired in connection with the acquisition is

not

deductible for income tax purposes.

The identifiable intangible assets included in the Company

’s purchase price allocation represent customer contracts and relationships of

$2,821,

intellectual property of

$1,132

and trade name of

$421

that are amortized straight-line over a period ranging from

years.

During the year ended

December 31, 2016,

direct acquisition costs of

$251

and increased cost of sales related to purchase accounting adjustments of

$96

for inventory acquired were recorded in the Company

’s Consolidated Statement of Income and Comprehensive Income. Accutronics contributed revenue of

$10,362

and operating income of

$436

during the

twelve

-month period ended

December, 2016,

reflecting the purchase accounting adjustments and non-recurring costs directly related to the acquisition.

Set forth below is the unaudited pro forma results of the Company for the

twelve

-month period ended

December 31,

2016

as if the acquisition occurred as of

January 1, 2015.

The unaudited pro forma results exclude direct acquisition costs of

$251

and cost of sales of

$96

related to the purchase accounting adjustments for inventory acquired. The results of Accutronics were

not

material for the period from

January 1, 2016

to the acquisition date.

	Year Ende d
	December 31, 201 6

Revenu e	$	82,460
Operating incom e	$	4,061
Net income attributable to Ultralif e	$	3,821
Earnings per share :
Basi c	$	0.25
Dilute d	$	0.25

The unaudited pro forma results do

not

reflect the realization of any expected cost savings or other synergies from the acquisition of Accutronics as a result of restructuring activities, other cost savings initiatives or sales synergies following the completion of the business combination. Accordingly, these unaudited pro forma results are presented for informational purposes only and

are

not

necessarily indicative of what the actual results of operations of the combined Company would have been if the acquisition had occurred at the beginning of the

2015

period presented, nor are they indicative of future results of operations.

Note 3 - Share Repurchase Program	12 Months Ended
Note 3 - Share Repurchase Program	Dec. 31, 2017
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	Note 3 – Share Repurchase Program On April 28, 2014, the Company ’s Board of Directors approved a share repurchase program (the “Share Repurchase Program”) which became effective on May 1, 2014 and under which the Company was authorized to repurchase up to 1.8 million shares of its outstanding common stock over a period not to exceed twelve months. The Share Repurchase Program was extended through June 2, 2016, and the maximum number of shares authorized to be repurchased under the program was increased to 3.4 million shares. Share repurchases under this program were made in accordance with SEC Rule 10b - 18 using a variety of methods, which included open market purchases and block trades in compliance with applicable insider trading and other securities laws and regulations. With the exception of repurchases made during stock trading black-out periods under 10b5 - 1 Plans, the timing, manner, price and amount of any repurchases were determined at the Company ’s discretion. The Share Repurchase Program expired on June 2, 2016 and did not obligate the Company to repurchase any specific number of shares. In 2016, we repurchased a total of 156,092 shares of our common stock for an aggregate consideration of $630, of which 149,904 shares were repurchased under the Share Repurchase Program for an aggregate amount (excluding fees and commissions) of $603. From the inception of the Share Repurchase Program on May 1, 2014 through its expiration on June 2, 2016, the Company repurchased 2,592,095 shares for an aggregate cost (excluding fees and commissions) of $10,480.

Note 4 - Supplemental Balance Sheet Information

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Supplemental Balance Sheet Disclosures [Text Block]

Note

- Supplemental Balance Sheet Information

a.	Inventory , N et

Inventories are stated at the lower of cost or net realizable value with cost determined under the

first

-in,

first

-out (FIFO) method. The composition of inventories

, net was:

	December 31,
	201 7		201 6
Raw M aterials	$	14,606	$	14,482
Work in P rocess		2,013		986
Finished P roducts		9,707		7,988
Total	$	26,326	$	23,456

b.	Property, Plant and Equipment

Major classes of property, plant and equipment consisted of the following:

	December 31,
	201 7			201 6
Land	$	123		$	123
Buildings and Leasehold I mprovements		7,858			7,757
Machinery and E quipment		50,852			49,722
Furniture and F ixtures		2,005			1,947
Computer Hardware and S oftware		5,338			5,223
Construction in P rogress		535			421
		66,711			65,193
Less – Accumulated Depreciation		(59,141	)		(57,194	)
Total	$	7,570		$	7,999

Estimated

costs to complete construction-in-progress as of

December 31, 2017

and

2016

were approximately

$5,136

and

$170,

respectively.

Depreciati

on expense was

$2,005

and

$2,223

for the years ended

December 31, 2017

and

2016,

respectively.

c.	Goodwill and Other Intangible Assets

The Company performed its annual impairment tests of goodwill and other indefinite-lived intangible assets as of

October 1, 2017.

The Company changed the date of its annual impairment test in

2017

from

December 31

to the

first

day of the

fourth

quarter. T

he change was made for administrative purposes and did

not

materially impact the estimated fair values.

The Company performed a quantitative impairment test of its

four

identified goodwill reporting units. The fair value for the reporting units could

not

be determined using readily available quoted Level

inputs or Level

inputs that were observable in active markets. Therefore, we used a discounted cash flow model to estimate the fair value of the reporting units, using Level

inputs. To estimate the fair value of the reporting units, we used significant estimates and judgments, including an assessment of our future revenue prospects, revenue growth rates and profit margins based on internal forecasts, industry and market based terminal growth rates, inputs to the weighted-average cost of capital used to discount future cash flows, and earnings multiples.

The Company performed a quantitative impairment test of its

four

other indefinite-lived intangible assets (trademarks). The fair value of our tradem

arks could

not

be determined using readily available quoted Level

inputs or Level

inputs that were observable in active markets. Therefore, we used a relief from royalty approach to estimate the fair value of our trademarks, using Level

inputs. Significant estimates and judgments included an assessment of our future revenue prospects, industry and market based terminal growth rates, inputs to the weighted-average cost of capital used to discount future cash flows, and royalty rates based on external market data.

As a result of the impairment tests performed for

2017

and

2016,

we determined that

impairments existed. Fair value exceeded carrying value for all reporting units and trademarks by more than

10%.

There is a possibility that our goodwill and other intangible assets could be impaired in the future should there be a significant change in our internal forecasts and other assumptions used in our impairment analysis.

The following table summarizes the goodwill activity by segment for the years ended

December 31,

201

and

2016:

	Battery & Energy Products			Communi- cations Systems		Total
Balance – January 1, 2016	$	4,790		$	11,493	$	16,283
Acquisition of Accutronics		4,487			-		4,487
Effect of Foreign Currency T ranslation		(805	)		-		(805	)
Balance – December 31, 2016		8,472			11,493		19,965
Effect of Foreign Currency T ranslation		493			-		493
Balance – December 31, 2017	$	8,965		$	11,493	$	20,458

The composition of intangible assets was:

	December 31, 201 7
	Cost		Accumulated Amortization		Net
Trademarks	$	3,411	$	-	$	3,411
Customer R elationships		6,618		4,208		2,410
Patents and T echnology		5,545		4,595		950
Distributor R elationships		377		377		-
Trade Name		393		79		314
Total Other Intangible A ssets	$	16,344	$	9,259	$	7,085

	December 31, 201 6
	Cost		Accumulated Amortization		Net
Trademarks	$	3,404	$	-	$	3,404
Customer R elationships		6,395		3,975		2,420
Patents and T echnology		5,455		4,417		1,038
Distributor R elationships		377		368		9
Trade Name		359		36		323
Total Other Intangible A ssets	$	15,990	$	8,796	$	7,194

The change in the cost value of other intangible assets is a result of the effect of foreign currency translations.

Amortization of

other intangible assets was included in the following financial statement captions:

	Year ended December 31,
	201 7		201 6
Research and Development Expense	$	165	$	200
Selling, General and Administrative E xpense		257		303
Total	$	422	$	503

Future amortization expense of amortizable intangible assets will be approximately

$400,

$379,

$367,

$348

and

$334

for the fiscal years ending

December 31, 2018

through

2022,

respectively.

Note 6 - Debt

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Debt Disclosure [Text Block]

Note

- Debt

Credit Facilities

May 31, 2017,

Ultralife Corporation entered into a Credit and Security Agreement (the “Credit Agreement”) and related security agreements with KeyBank National Association (“KeyBank” or the “Bank”) to establish a

$30,000

senior secured, cash flow-based, revolving credit facility that includes a

$1,500

letter of credit subfacility (the “Credit Facility”). The Credit Agreement provides that the Credit Facility

may

be increased with the Bank

’s concurrence to

$50,000

prior to the last

six

months of the term and is scheduled to expire on

May 30, 2020.

The Credit Facility replaces the Company’s asset-based revolving credit facility with PNC Bank National Association which expired in accordance with its terms on

May 24, 2017 (

the “Prior Credit Agreement”).

The Credit Facility provides the Company with an aggregate of up to

$30,000

of loan and letter of credit availability determined based on a borrowing base formula. The Company

may

use advances under the Credit Facility for general working capital purposes, to reimburse drawings under letters of credit and to fund capital expenditures and acquisitions, all subject to the terms of the Credit Agreement. The Company had

amounts drawn under the Prior Credit Agreement at the time of its expiration and has

not

borrowed under the Credit Facility.

Interest will accrue on outstanding indebtedness under the Credit Agreement at the Overnight LIBOR Rate plus the applicable margin, or at the Base Rate plus the applicable margin, as selected by the Company. During the period beginning

May 31, 2017

and ending

April 1, 2018,

the applicable margin for Overnight LIBOR Loans is

185

basis points, the applicable margin for Base Rate Loans is negative

basis points and applicable margin for the Unused Fee is

basis points. Beginning

April 2, 2018

and thereafter, the applicable margins will be determined based on the chart below.

Consolidated Senior Leverage Ratio	Applicable Basis Points for Overnight LIBOR Loans		Applicable Basis Points for Base Rate Loans		Applicable Basis Points for Unused Fee
Less than 1.50 to 1.00		185		(50)		20
Greater than or equal to 1.50 to 1.00 but less than 2.50 to 1.00		200		(25)		15
Greater than or equal to 2.50 to 1.00		215		0		10

The Company must pay a fee on its unused availability equal to the applicable margin for the Unused Fee and customary letter of credit fees.

In addition to the affirmative and negative covenants, the Company must maintain a fixed charge coverage ratio of

1.15

1.0,

tested each fiscal quarter for the trailing

four

fiscal quarters, and a minimum tangible net worth of

$40,000,

tested as of the end of each calendar year. The Company was in full compliance with its covenants as of

December 31, 2017.

Any outstanding borrowings must be repaid upon expiration of the term of the Credit Facility. Payments must be made during the term to the extent outstanding borrowings exceed the maximum amount then permitted to be drawn as borrowings under the Credit Facility and from the proceeds of certain transactions. Upon the occurrence of an event of default, the outstanding obligations of the Company under the Credit Facility

may

be accelerated in addition to the other remedies available to the Bank under the terms of the Credit Agreement. The Credit Facility is secured by substantially all the assets of the Company.

As of

December 31,

201

we had

outstanding balance under the Credit Facility and

outstanding letters of credit related to the Credit Facility.

Note 7 - Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

Note

- Commitments and Contingencies

Indemnity

Our organizational documents provide that our directors or officers will be reimbursed for all expenses, to the fullest extent permitted by law arising out of their performance.

b.	Purchase Commitments

As of

December 31,

201

we have made commitments to purchase approximately

$1,392

of production machinery and equipment.

China

Our operating facility in China presents risks

including, but

not

limited to, changes in local regulatory requirements, including changes in labor laws, local wage laws, environmental regulations, taxes and operating licenses, compliance with U.S. regulatory requirements, including the Foreign Corrupt Practices Act, uncertainties as to application and interpretation of local laws and enforcement of contract and intellectual property rights,

eminent domain claims, labor disputes, rapid changes in government, economic and political policies,

and other various contingencies that are outside of our control. Any such event could depress our earnings and have other material adverse effects on our business, financial condition and results of operations.

d.	Employment Contracts

We have an employment contract with Michael D. Popielec, our President and Chief Executive Officer, which

remains in effect until terminated by either party. This agreement provides for a base salary, as adjusted for increases at the discretion of our Board of Directors, and includes incentive bonuses based upon attainment of specified quantitative and qualitative performance goals. This agreement also provides for severance payments in the event of specified events of termination of employment. In addition, this agreement provides for a lump sum payment in the event of termination of employment in connection with a change in control.

As part of our employment commencement process,

employees are required to enter into agreements providing for confidentiality of certain information and the assignment of rights to inventions made by them while employed by us. These agreements also contain certain non-competition and non-solicitation provisions effective during the employment term and for varying periods thereafter depending on position and location. There can be

assurance that we will be able to enforce these agreements. All of our employees agree to abide by the terms of a Code of Ethics policy that provides for the confidentiality of certain information received during the course of their employment.

e.	Product Warranties

We estimate future costs associated with expected product failure rates, material usage and service costs in the development of our warranty obligations. Warranty reserves are based on historical experience of warranty claims and generally will be estimated as a percentage of sales over the warranty period. In the event the actual results of these items differ from the estimates, an adjustment to the warranty obligation would be recorded. Changes in our product warranty liability during the years ended

December 31,

and

2016

were as follows:

	201 7			201 6
Balance, January 1	$	172		$	192
Provision (reversal) for warranties issued		84			39
Settlements made		(107	)		(59	)
Balance, December 31	$	149		$	172

f .	Legal Matters

We are subject to legal proceedings and claims that arise in the normal course of business. We believe that the final disposition of such matters will

not

have a material adverse effect on our financial position, results of operations or cash flows.

Dreamliner Litigation

July 2013,

an unoccupied Boeing

787

Dreamliner aircraft operated by Ethiopian Airlines (“EA”) was damaged by a fire while parked at London Heathrow Airport. We participated in and provided technical assistance in support of an investigation of this incident conducted by U.K. and U.S. regulatory authorities as well as by the manufacturer of the aircraft, as we are

one

of many downstream suppliers to that manufacturer.

A final report was issued by the Air Accidents Investigative Branch - - UK Civil Aviation regulatory authority, with findings indicating that the fire was primarily caused by circumstances related to the plane’s emergency locator transmitter (“ELT”) manufactured and installed by another company.

A component of the ELT is a battery pack which incorporates Ultralife

’s industry-standard Lithium Manganese Dioxide non-rechargeable D-cell. Ultralife has had this cell in production since

2001,

with millions of units produced. The cell is widely-used for global defense and commercial applications. This battery product has gone through rigorous safety and qualification testing, including United Nations Transport of Dangerous Goods, Manual of Tests and Criteria, and is authorized for use in aerospace applications under Technical Standard Order

C142.

May 4, 2015,

we were notified of a lawsuit in which we were named, along with other suppliers to the aircraft manufacturer, concerning that

2013

fire. The suit was filed by EA in the Commercial Court, Queen

’s Bench Division of the High Court of Justice, London and seeks as damages

$42,000

plus other unspecified amounts, including those for loss of use and diminution in value of the aircraft. We maintain liability and products liability insurance through reputable providers, and in accordance with our corporate practices, immediately advised and referred this matter to our insurers. We are working with those insurers and their counsel to actively defend against this action, which is ongoing.

At this time, we believe that there is

not

a reasonable possibility that this incident will result in a material financial exposure to the Company.

Note 8 - Shareholders' Equity

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Shareholders' Equity and Share-based Payments [Text Block]

Note

- Shareholders' Equity

a.	Stock -B ased Compensation Expense

We recorded non-cash stock compensation expense in each period as follows:

	201 7		201 6
Stock O ptions	$	642	$	676
Restricted Stock Grants		11		34
Total	$	653	$	710

These are more fully discussed as follows:

b .	Stock Options

We have various stock-based employee compensation plans, for which compensation cost is recognized in the financial statements. The cost is measured at the grant date, based on the fair value of the award, and is recognized as an expense over the employee

’s requisite service period (generally the vesting period of the equity award).

Our shareholders have approved various equity-based plans that permit the grant of stock options, restricted stock and other equity-based awards. In addition, our shareholders have approved the grant of stock options outside of these plans.

June 2004,

our shareholders adopted the

2004

Long-Term Incentive Plan (

“2004

LTIP”) pursuant to which we were authorized to issue up to

750,000

shares of common stock and grant stock options, restricted stock awards, stock appreciation rights and other stock-based awards. Through shareholder approved amendments to the LTIP in

2006,

2008,

2011,

and

2013,

the total number of shares authorized under the LTIP w

as increased to

2,900,000.

June 2014,

our shareholders approved the

2014

Long-Term Incentive Plan (

“2014

LTIP”)

as the successor plan to the

2004

LTIP that expired on

June 10, 2014.

Under the

2014

LTIP, a total of

1,750,000

shares of Common Stock will be available for grant of awards. However, of the total number of shares of common stock available for awards under the

2014

LTIP,

more than

800,000

shares of Common Stock

may

be used for awards other than stock options and stock appreciation rights. Grants under the

2014

LTIP

may

be awarded through

June 2, 2024.

Stock options granted under the LTIPs are either Incentive Stock Options (“ISOs”) or Non-Qualified Stock Options (“NQSOs”). Key employees are eligible to receive ISOs and NQSOs; however, directors and consultants are eligible to receive only NQSOs. Most ISOs vest over a

three

- year period and expire on the

seventh

anniversary of the grant date. As of

December 31, 2017,

there were

1,116,083

stock options outstanding under the

2004

LTIP and

744,128

stock options outstanding under the

2014

LTIP.

December 30, 2010,

pursuant to the terms of his employment agreement, we granted our President and Chief Executive Officer, Michael D. Popielec, options to purchase shares of common stock under the

2004

LTIP as follows: (i)

50,000

shares at

$6.42,

vest

ing in annual increments of

12,500

shares over a

four

-year period commencing

December 30, 2011; (

ii)

250,000

shares at

$6.42,

vesting in annual increments of

62,500

shares over a

four

-year period commencing

December 30, 2011; (

iii)

200,000

shares at

$10.00,

with vesting to begin on the date the stock reaches a closing price of

$10.00

per share for

trading days within a

-day trading period, with such vesting in annual increments of

50,000

shares over the

four

anniversary dates of that date; and (iv)

200,000

shares at

$15.00,

with vesting to begin on the date the stock reaches a closing price of

$15.00

per share for

trading days within a

-day trading period, with such vesting in annual increments of

50,000

shares over the

four

anniversary dates of that date. All such options in items (i) and (ii) were due to expire on

December 30, 2017.

April 19, 2017,

the Company’s Board of Directors extended the expiration date to

December 30, 2020.

Pursuant to Accounting Standards Codification Topic

718,

Compensation – Stock Compensation, the transaction was accounted for as an equity award modification. During the

second

quarter, the Company recognized compensation cost of

$193

representing the incremental fair value of the modified award computed as of the modification date as the difference between the fair value of the modified award and the fair value of the original award immediately before it was modified.

All such options in items (iii) and (iv) shall expire as of the later of

December 30, 2017

and

five

years after the initial vesting commences, but in

event later than

December 30, 2020.

The market-based conditions for the stock options in items (iii) and (iv) had

not

been met as of

December 31, 2017.

The options set forth in items (ii), (iii) and (iv) were subject to shareholder approval of an amendment to the

2004

LTIP, which approval was obtained on

June 7, 2011.

January 3, 2011,

pursuant to the terms of his employment agreement, we granted our President and Chief Executive Officer, Michael D. Popielec, an option to purchase

50,000

shares of common stock at

$6.58

under the

2004

LTIP. The option vested in annual increments of

12,500

shares over a

four

-year period commencing

December 30, 2011.

The option expired on

December 30, 2017.

As of

December 31,

201

there was

$385

of total unrecognized compensation costs related to outstanding stock options, which we expect to recognize over a weighted average period of

1.0

years.

We use the Black-Scholes option-pricing model to estimate fair value of stock-based awards. The following weighted average assumptions were used to value options granted during the years ended

December 31,

201

and

2016:

	Years Ended December 31,
	201 7			201 6
Risk-free interest rate		1.7	%		1.4	%
Volatility factor		50.0	%		48.2	%
Weighted average expected life (years)		5.0			4.8
Forfeiture rate		10.0	%		10.0	%
Dividends		0.0	%		0.0	%

We used a Monte Carlo simulation option-pricing model to estimate the fair value of market performance stock-based awards, of which there were

new awards in the years ended

December 31,

201

2016.

We calculate expected volatility for stock options by taking an average of historical volatility over the

expected term. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards and vesting schedules. The interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield in effect at the time of grant. Forfeiture rates are calculated by dividing unvested shares forfeited by beginning shares outstanding. The pre-vesting forfeiture rate is calculated yearly and is determined using a historical

twelve

-quarter rolling average of the forfeiture rates.

The following tables summarize data for the stock options issued by us:

Year Ended December 31, 201 7
	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Shares under Option – January 1		2,323,581		$	6.22
Options Granted		244,750			5.60
Options Exercised		(333,305	)		4.29
Options Forfeited or Expired		(374,815	)		8.11
Shares under option – December 31		1,860,211		$	5.06		2.93	$	2,624
Vested and Expected to Vest - December 31		1,649,594		$	4.63		2.75	$	2,438

Options Exercisable – December 31		1,045,798		$	4.18		2.63	$	1,806

Year Ended December 31, 201 6
	Number of Shares			Weighted Average Exercise Price Per Share
Shares under O ption – January 1		2,257,969		$	6.30
Options G ranted		369,550			4.69
Options E xercised		(152,789	)		3.86
Options Forfeited or E xpired		(151,149	)		6.09
Shares under option – December 31		2,323,581		$	6.22

Options E xercisable – December 31		1,302,390		$	5.05

The following table represents additional information about stock options

outstanding at

December 31, 2017:

			Option O utstanding						Options E xercisable
Range of Exercise Prices			Number of Outstanding Options – December 31, 2017		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Number of Options Exercisable at December 31, 201 7		Weighted- Average Exercise Price
$3.22	-	$3.99		435,398		3.28	$	3.78		368,406	$	3.80
$4.00	-	$4.99		510,213		3.27		4.37		335,624		4.40
$5.00	-	$9.99		614,600		5.56		5.69		341,768		5.77
$10.00	-	$15.00		300,000		2.00		12.50		-		-

$3.22	-	$15.00		1,860,211		2.93	$	5.06		1,045,798	$	4.18

The weighted average fair value of options granted during the years ended

December 31, 2017

and

2016

was

$2.47

and

$2.01,

respectively. The total intrinsic value of options (which is the amount by which the stock price exceeded the exercise price of the options on the date of exercise) exercised during the years ended

December 31, 2017

and

2016

was

$588

and

$149,

respectively.

Cash received from option exercises under our stock-based compensation plans for the years ended

December 31,

201

and

2016

was

$1,429

and

$460,

respectively.

c .	Restricted Stock Awards

During

2014,

we awarded

49,200

restricted stock units under the

2014

LTIP to certain key employees. These units vest over

three

years and we estimated their weighted average grant date fair value to be

$3.24

per share

$11

and

$34

of expense was recorded in

2017

and

2016,

respectively, relating to these units. In

September 2017,

12,900

shares of the awarded restricted stock vested and the Company repurchased

3,959

shares to satisfy the statutory tax withholding on shares vested for certain employees.

December 31,

201

there was

unrecognized compensation expense related to restricted stock grants.

d .	Reserved Shares

We have

reserved

946,027

shares of common stock under the various stock option plans, warrants and restricted stock awards as of

December 31, 2017.

Note 9 - Income Taxes

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Income Tax Disclosure [Text Block]

Note

- Income Taxes

Our income tax provision consists of:

	Years Ended December 31,
	201 7			201 6
Current:
Federal	$	-		$	(70	)
State		-			20
Foreign		300			13
		300			(37	)
Deferred:
Federal		(1,717	)		220
State		55			-
Foreign		(7	)		(85	)
		(1,669	)		135
Total income tax provision	$	(1,369	)	$	98

December 22, 2017,

the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “

Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code, including, but

not

limited to, (

) reducing the U.S. federal corporate tax rate from

percent to

percent; (

) elimination of the corporate alternative minimum tax (AMT) and changing how existing AMT credits can be realized; (

) changing rules related to usage and limitation of net operating loss carryforwards created in tax years beginning after

December 31, 2017; (

) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries for tax years beginning after

December 31, 2017;

and (

) implementing a territorial tax system and imposing a transition toll tax on deemed repatriated earnings of foreign subsidiaries.

The Act reduces the U.S. corporate tax rate to

percent, effective

January 1, 2018.

Deferred tax liabilities associated with goodwill and certain other intangible assets have been reduced by

$1,939,

resulting in a deferred income tax benefit of

$1,939

for the year ended

December 31, 2017.

The Act pr

ovided for a

one

-time deemed mandatory repatriation for post-

1986

undistributed foreign subsidiary earnings and profits (“E&P”) through the year ended

December 31, 2017.

The Company had a deficit in foreign E&P and is

not

expected to be subject to the deemed mandatory repatriation.

December 22, 2017,

the SEC staff issued Staff Accounting Bulletin

No.

118

to address the application of U.S. GAAP in situations when a registrant does

not

have the necessary information available, prepared, or analyzed (in

cluding computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Reform Act. The Company has recognized the provisional tax impacts related to the revaluation of deferred tax assets and liabilities and included these amounts in its consolidated financial statements for the year ended

December 31, 2017.

As of

December 31, 2017,

we have completed the majority of our accounting for the tax effects of the Act. If revisions are needed as new information becomes available, the final determination of the deemed re-measurement of our deferred assets and liabilities or other applicable provisions of The Act will be completed as additional information becomes available, but

later than

one

year from the enactment of the

2017

Tax Act.

The deferred U.S. income tax benefit for

2017

primarily represents a

one

-time, non-cash benefit of

$1,939

relating to the revaluation of deferred tax liabilities on goodwill and certain other intangible assets upon the enactment of the Ta

Act, offset by the increase in the deferred tax liability associated with the increase in the taxable temporary difference related to the goodwill and certain other indefinite-lived intangible assets. The deferred income tax provision for

2016

is primarily due to the recognition of deferred tax liabilities relating to goodwill and certain other intangible assets that cannot be predicted to reverse during our loss-carryforward for book purposes partially offset by the deferred tax benefit of the amortization of certain intangible assets of Accutronics (U.K.). The current income tax provision is primarily attributable to the operating income of Accutronics (U.K.). The benefit associated with the current income tax provision in

2016

is primarily related to an excess accrual of income taxes in prior years.

Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amount used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows:

	Years Ended December 31,
	2017			2016
Deferred Tax Liabilities:
Property, Plant and Equipment	$	-		$	-
Other		38			-
Intangible Assets		3,806			5,471
Total Deferred Tax Liabilities		3,844			5,471

Deferred Tax Assets:
Property, Plant and Equipment		44			77
Net Operating Loss Carryforwards		17,870			27,127
Tax Credit Carryforwards		1,837			1,704
Intangible Assets		1,535			2,923
Accrued Expenses, Reserves and Other		1,359			1,527
Total Deferred Tax Assets		22,645			33,358
Valuation Allowance for Deferred Tax Assets		(22,636	)		(33,331	)
Net Deferred Tax Assets		9			27

Net Deferred Tax Liabilities	$	3,835		$	5,444

Net deferred tax liabilities are

comprised of the following balance sheet amounts:

	Years Ended December 31,
	201 7			2016

Non-Current Deferred Tax Assets	$	32		$	94
Non-Current Deferred Tax Liabilities		(3,867	)		(5,538	)
	$	(3,835	)	$	(5,444	)

The valuation allowance for deferred tax

assets decreased by

$10,695

and

$1,262

in the years ended

December 31, 2017

and

2016,

respectively. The decreases in the valuation allowance were due to the reduction of deferred tax assets due to the Company’s pretax income as well as the revaluation of the deferred taxes due to the enactment of the Tax Cuts and Jobs Act

Effective

January 1, 2017,

the Company adopted ASU

2016

09,

Compensation - Stock Compensation (Topic

718

): Improvement to Employee Share-Based Payment Accounting.

As a result of the adoption, the Company recognized a gross deferred tax asset of

$1,123

and a corresponding valuation allowance in the same amount resulting in

net deferred tax asset recognition.

2017

and

2016,

in the U.S. and for certain past operations in the U.K., we continue to report a valuation allowance for our net operating loss carryforwards and other deferred tax assets that cannot be offset by reversing temporary differences. The rec

ognition of the valuation allowance is based on an assessment of all available evidence, both positive and negative, weighted based on objective verifiability. The assessment of the realizability of the U.S. deferred tax assets was based on a number of factors including our history of operating losses, our historical operating volatility, our historical inability to accurately forecast earnings for future periods and the continued uncertainty of the general business climate. The use of our U.K. net operating loss carryforwards

may

be limited due to the change in the past U.K. operation. Based on our assessment of all available evidence and its weighting based on objective verifiability, we concluded that the realizability of these deferred tax assets is

not

more likely than

not.

In both

2017

and

2016,

we have

not

recognized a valuation allowance against our other foreign deferred tax assets as we believe that it is more likely than

not

that they will be realized. We will continue to evaluate the realizability of our deferred tax assets in future periods.

As of

December 31, 2017,

we have domestic and foreign NOLs totaling

$69,594

and

$12,760,

respectively, and domestic tax credits of approximately

$1,837,

available to reduce future taxable income. Included in our NOL carryforward are foreign loss carryforwards of approximately

$12,760,

nearly all of which can be carried forward indefinitely. The domestic NOL carryforward of

$69,594

expires beginning in

2019,

through

2034.

December 31, 2017,

the Company maintains its assertion that all foreign earnings will be indefinitely reinvested in those operations.

For financial reporting purposes, income

from continuing operations before income taxes is as follows:

	Years Ended December 31,
	201 7		2016
United States	$	4,831	$	2,803
Foreign		1,464		777
	$	6,295	$	3,580

The provision for income taxes differs from the amount of income tax determined by applying the applicable U.S. statutory federal income tax rate to income (loss) from continuing operations before income taxes as follows:

	Years Ended December 31,
	2017			2016

Statutory Income Tax Rate		34	%		34.0	%
(Increase) Decrease in Tax Provision Resulting From:
Equity Compensation		0.7			9.6
Income Tax Credits		(0.9	)		(6.2	)
Foreign Tax Rates		(3.8	)		(2.2	)
Release of Unrecognized Tax Benefits		-			-
Valuation Allowance		(20.9	)		(30	)
Excess Accrual		-			(5.2	)
Tax Rate Change		(30.8	)		-
Other		(0.1	)		2.7
Effective Income Tax Rate		(21.8	)%		2.7	%

Accounting for Uncertainty in Income Taxes

There were

unrecognized tax benefits related to uncertain tax positions at

December 31, 2017

and

2016.

As a result of our operations, we file income tax returns in various jurisdictions including U.S. federal, U.S. state and foreign jurisdictions. We are routinely subject to examination by taxing authorities in these various jurisdictions. Our U.S. tax matters for the years

2002

through

2017

remain subject to examination by the Internal Revenue Service (“IRS”) due to our NOL carryforwards. Our U.S. tax matters for the years

2002

through

2017

remain subject to examination by various state and local tax jurisdictions due to our NOL carryforwards. Our tax matters for the years

2009

through

2017

remain subject to examination by the respective foreign tax jurisdiction authorities.

Note 11 - Business Segment Information

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

Note

- Business Segment Information

We report our results in

two

operating segments: Battery & Energy Products and Communications Systems. The Battery & Energy Products segment includes:

Lithium

-volt, cylindrical and various other non-rechargeable batteries, in addition to rechargeable batteries, uninterruptable power supplies, charging systems and accessories. The Communications Systems segment includes: RF amplifiers, power supplies, cable and connector assemblies, amplified speakers, equipment mounts, case equipment, man-portable systems, integrated communication systems for fixed or vehicle applications and communications and electronics systems design. We believe that reporting performance at the gross profit level is the best indicator of segment performance.

2017:

	Battery & Energy Products		Communications Systems		Corporate			Total
Revenue	$	69,789	$	15,742	$	-		$	85,531
Segment Contribution		19,659		6,573		(19,756	)		6,476
Interest Expense, Net						(183	)		(183	)
Miscellaneous						(2	)		(2	)
Income Tax Benefit						1,369			1,369
Non-Controlling Interest						(16	)		(16	)
Net Loss Attributable to Ultralife								$	7,648

Total Assets	$	44,720	$	32,169	$	20,297		$	97,186
Capital Expenditures	$	1,015	$	212	$	63		$	1,290
Goodwill	$	8,965	$	11,493	$	-		$	20,458
Depreciation and Amortization of Intangible Assets	$	1,830	$	430	$	167		$	2,427
Stock-Based Compensation	$	301	$	88	$	264		$	653

2016

	Battery & Energy Products		Communications Systems		Corporate			Total
Revenue	$	64,753	$	17,707	$	-		$	82,460
Segment Contribution		19,580		5,528		(21,345	)		3,763
Interest Expense, Net						(263	)		(263	)
Miscellaneous						80			80
Income Tax Provision						(98	)		(98	)
Non-Controlling Interest						27			27
Net Income Attributable to Ultralife								$	3,509

Total Assets	$	39,691	$	32,021	$	13,032		$	84,744
Capital Expenditures	$	852	$	158	$	367		$	1,377
Goodwill	$	8,472	$	11,493	$	-		$	19,965
Depreciation and Amortization of Intangible Assets	$	2,042	$	541	$	143		$	2,726
Stock-Based Compensation	$	403	$	110	$	197		$	710

U.S. and

n-U.S. Revenue Information

201 7 :	Total Revenue		United States			Non-United States
Battery & Energy Products	$	69,789	$	33,397		$	36,392
Communications Systems		15,742		14,217			1,525
Total	$	85,531	$	47,614		$	37,917
				56	%		44	%

2016:	Total Revenue		United States			Non-United States
Battery & Energy Products	$	64,753	$	29,587		$	35,166
Communications Systems		17,707		15,507			2,200
Total	$	82,460	$	45,094		$	37,366
				55	%		45	%

Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases

may

serve non-U.S. projects

Long-lived assets (including goodwill and intangible assets) held outside the U.S., principally

in the United Kingdom and China, were

$12,443

and

$11,652

December 31, 2017

and

2016,

respectively.

Commercial and Government/Defense Revenue Information:

201 7 :	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	69,789	$	40,790		$	28,999
Communications Systems		15,742		-			15,742
Total	$	85,531	$	40,790		$	44,741
				48	%		52	%

201 6 :	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	64,753	$	40,886		$	23,867
Communications Systems		17,707		-			17,707
Total	$	82,460	$	40,886		$	41,574
				50	%		50	%

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

b.	Principles of Consolidation

Use of Estimates, Policy [Policy Text Block]

c.	Management's Use of Judgment and Estimates

valuation of assets acquired and liabilities assumed in business combinations; (d) various expense accruals; and (e) stock-based compensation. Our actual results could differ from these estimates.

Reclassification, Policy [Policy Text Block]

d.	Reclassifications

Certain items previously reported in specific financial statement captions

are reclassified to conform to the current presentation. There were

material reclassifications for the years ended

December 31, 2017

and

2016.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash

Our cash balances

may

at times exceed federally insured limits.

We have

not

experienced any losses in these accounts and believe we are

not

exposed to any significant risk with respect to cash.

Receivables, Policy [Policy Text Block]

f.	Accounts Receivable and Allowance for Doubtful Accounts

We extend credit to our customers in the normal course of business. We perform ongoing credit evaluations and generally do

not

Allowance for doubtful accounts was

$292

and

$277

for the years ended

December 31, 2017

and

2016,

respectively.

Inventory, Policy [Policy Text Block]

g.	Inventories

Inventories are stated at the lower of cost or net realizable value with cost determined under the

first

-in,

first

-out (FIFO) method. We record provisions for excess, obsolete or slow-moving inventory based on changes in customer demand, technology developments or other economic factors.

Property, Plant and Equipment, Policy [Policy Text Block]

h.	Property, Plant and Equipment

Property, plant and equipment are stated at cost.

Depreciation and amortization are computed using the straight-line method over the estimated useful lives. Estimated useful lives are as follows (in years):

Building s	1 0	–	2 0
Machinery and Equipmen t	5	–	1 0
Furniture and Fixture s	3	–	1 0
Computer Hardware and Softwar e	3	–	5
Leasehold Improvement s	Lesser of useful life or lease ter m

Goodwill and Intangible Assets, Policy [Policy Text Block]

i.	Long-Lived Assets, Goodwill and Intangibles

We assess all of our long-lived assets for impairment when events or circumstances indicate that their carrying amounts

may

not

is an industry-based weighted average cost of capital. If the expected undiscounted future cash flows exceed the respective carrying amount as of the date of assessment,

impairment is recognized.

The purchase price paid to effect an acquisition is allocated to the acquired tangible and intangible assets and liabilities at fair value. We do

not

amortize goodwill and intangible assets with indefinite lives, but instead evaluate these assets for impa

The quantitative impairment test for goodwill consists of a comparison of the fair value of the reporting unit with the carrying amount of the reporting unit to which it is assigned.

If the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered

not

impaired. If the carrying amount of a reporting unit exceeds its fair value, a

second

Foreign Currency Transactions and Translations Policy [Policy Text Block]

j.	Translation of Foreign Currency

The financial statements of our foreign subsidiaries are translated

December 31, 2017

and

2016

were $(

) and

$86,

respectively.

Revenue Recognition, Policy [Policy Text Block]

k .	Revenue Recognition

Product Sales

not

have a general right of return on products shipped.

For products shipped under vendor managed inventory arrangements, revenue is recognized when the product is consumed by the customer, at which point title has transferred and there are

further obligations by the Company.

Deferred Revenue

–

For each source of revenues, we defer recognition if: (i) evidence of an agreement does

not

exist,( ii) delivery or service has

not

occurred, (iii) the selling price is

not

fixed or determinable, or (iv) collectability is

not

reasonably assured.

Guarantees, Indemnifications and Warranties Policies [Policy Text Block]

l.	Warranty Reserves

Shipping and Handling Cost, Policy [Policy Text Block]

m.	Shipping and Handling Costs

Costs incurred by us related to shipping and handling are included in cost of products sold. Amounts charged to customers pertaining to these costs are reflected as revenue.

Advertising Costs, Policy [Policy Text Block]

n.	Advertising Expenses

Advertising costs are expensed as incurred and are included in selling, general and administrative expenses in the accompanying Consolidated Statements of

Income and Comprehensive Income. Such expenses amounted to

$26

and

$32

for the years ended

December 31, 2017

and

2016,

respectively.

Research and Development Expense, Policy [Policy Text Block]

o.	Research and Development

201

and

2016,

we expended

$5,142

and

$6,155,

respectively, on research and development, including

$405

and

$209,

respectively, on customer sponsored research and development activities, which are included in cost of goods sold. We recognized

$405

and

$209

of revenue relating to these activities during

2017

and

2016,

respectively.

Environmental Cost, Expense Policy [Policy Text Block]

p.	Environmental Costs

Environmental expenditures that relate to current operations are expensed. Remediation costs that relate to an existing condition

caused by past operations are accrued when it is probable that these costs will be incurred and can be reasonably estimated.

Income Tax, Policy [Policy Text Block]

q.	Income Taxes

A valuation allowance is required when it is more likely than

not

that the recorded value of a deferred tax asset will

not

be realized. As of Decem

ber

31,

2017,

not

2015,

our historical operating volatility, our historical inability to accurately forecast earnings for future periods, and the continued uncertainty of the general business climate as of the end of

2017.

December 31, 2016.

Concentration Risk, Credit Risk, Policy [Policy Text Block]

r.	Concentration Related to Customers and Suppliers

During t

he year ended

December 31, 2017,

we had

one

major customer, a large defense primary contractor, which comprised

18%

and

12%

of our revenues in

2017

and

2016,

respectively. During the year ended

December 31, 2016,

another large defense primary contractor comprised

13%

of our sales; however, sales to this customer in

2017

comprised

of our sales. There were

other customers that comprised greater than

10%

of our total revenues during these years.

Currently, we do

not

We generally do

not

have been substantial during

2017

and

2016,

we do

not

consider this customer to be a significant credit risk. We do

not

normally obtain collateral on trade accounts receivable.

may

elect to develop relationships with a single or limited number of suppliers for materials and components that are otherwise generally available.

Fair Value Measurement, Policy [Policy Text Block]

s.	Fair Value Measurements and Disclosures

Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into

three

levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level

Quoted prices in active markets for identical assets or liabilities.

Level

Observable inputs, other than Level

prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are

not

active; or other inputs that are observable or that we corroborate with observable market data for substantially the full term of the related assets or liabilities.

Level

Unobservable inputs supported by little or

market activity that are significant to the fair value of the assets or liabilities.

The fair value of financial instruments approximated their carrying values at

December 31, 2017 and 2016.

The fair value of cash, trade accounts receivable, trade accounts payable, and accrued liabilities approximates carrying value due to the short-term nature of these instruments.

Earnings Per Share, Policy [Policy Text Block]

t.	Earnings Per Share

Basic earnings per share is computed by dividing net income or loss

2017

include

1,035,711

outstanding in-the-money stock options that add

330,676

shares to the number of shares outstanding. Diluted earnings per share in

2016

include

1,238,804

outstanding in-the-money stock options that add

135,458

shares to the number of shares outstanding, and include

15,900

restricted stock units that add

9,538

shares outstanding. There were

unvested restricted stock units as of

December 31, 2017.

Diluted earnings per share calculations exclu

de the effect of

824,500

and

1,332,281

employee stock options in

2017

and

2016,

respectively, as such options have an exercise price in excess of the weighted average market price of the Company’s common stock.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

u.	Stock-Based Compensation

We have various stock-based employee compensation plans

that are described more fully in Note

Segment Reporting, Policy [Policy Text Block]

v.	Segment Reporting

We have

two

operating segments

New Accounting Pronouncements, Policy [Policy Text Block]

w.	Recent Accounting Pronouncements

November 2015,

the Financial Accounting Standards Board (“

FASB”) issued Accounting Standards Update (“ASU”)

2015

17,

2015

is effective for public companies for annual and interim periods beginning after

December

15,

2016.

During the

first

quarter of

2017,

we adopted ASU

2015

on a retrospective basis. As such, we reclassified

$32

and

$94

of foreign current deferred tax assets to non-current on the consolidated balance sheets as of

December 31, 2017

and

2016,

respectively. The deferred tax liabilities relate to U.S. tax obligations which cannot be netted against foreign deferred taxes. The adoption of ASU

2015

did

not

affect our consolidated statements of income.

March 2016,

the FASB issued ASU

2016

09,

“

Compensation – Stock Compensation (Topic

718

2016

is effective for public companies for annual and interim periods beginning after

December

15,

2016.

We adopted the new accounting standard in the

first

quarter of

2017

$1,123

and an offsetting increase in the valuation allowance. There was

impact to the Company’s retained earnings as a result of adopting this new accounting standard.

July 2015,

the FASB issued ASU

2015

11,

"Simp

December 15, 2016,

and must be applied on a retrospective basis. We adopted the new accounting standard in the

first

quarter of

2017.

There was

material impact to the Company's financial statements as a result of adopting this new accounting standard.

May 2014,

the Financial Accounting Standards Board (

“FASB”) issued Accounting Standards Update

No.

2014

(Topic

606

is effective for annual reporting periods beginning after

December 15, 2017,

including interim periods within that reporting period. The company will adopt Topic

606

effective

January 1, 2018.

Topic

606

will

not

have a material impact on our Consolidated Financial Statements.

February 2016,

the

FASB issued Accounting Standards Update

No.

2016

02,

“Leases” requires that lessees recognize a right-to-use asset and related lease liability for all significant financing and operating leases

not

considered short-term leases, and specifies where in the statement of cash flows the related lease payments are to be presented. The guidance is effective for years beginning after

December 15, 2018

and early adoption is permitted. The Company has

not

yet determined the impact of this standard on our Consolidated Financial Statements, but believes it

may

be significant. We have elected

not

to adopt this standard in advance of its required effective date.

October 2016,

the FASB issued

Accounting Standards Update

No.

2016

16,

“Income Taxes (Topic

740

December 15, 2017,

740

effective

January 1, 2018.

Topic

740

will

not

have a material impact on our Consolidated Financial Statements.

August 2016,

the FASB issued

Accounting Standards Update

No.

2016

15,

“Statement of Cash Flows (Topic

230

), Classification of Certain Cash Receipts and Cash Payments”. The new guidance makes

eight

targeted changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The guidance is effective for fiscal years beginning after

December 15, 2017,

January 1, 2018.

This standard will

not

have a material impact on our Consolidated Financial Statements.

January 2017,

the FASB issued ASU

2017

04,

“

Intangibles – Goodwill and Other (Topic

350

) – Simplifying the Test for Goodwill Impairment”, which eliminates the

two

May 2017,

the FASB issued ASU

2017

09,

“

Compensation – Stock Compensation (Topic

718

718.

ASU

2017

is effective for fiscal years beginning after

December 15, 2017

and interim periods within those fiscal years, and early adoption is permitted, including in an interim period. ASU

2017

is to be applied on a prospective basis to an award modified on or after the adoption date. We do

not

intend to early adopt ASU

2017

and do

not

expect the adoption of this new accounting standard will have a material impact on our Consolidated Financial Statements.

Note 2 - Acquisition (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Cas h	$	1,304
Accounts Receivabl e		1,344
Inventor y		2,167
Prepaids and Other Current Asset s		584
Property, Plant & Equipmen t		269
Identifiable Intangible Asset s		4,374
Goodwil l		4,487
Accounts Payabl e		(1,009	)
Accrued Expense s		(1,136	)
Income Taxes Payabl e		(111	)
Non-Current Liabilitie s		(209	)
Deferred Income Taxe s		(74	)
Deferred Income Taxes on Intangible Asset s		(829	)

Total Consideratio n	$	11,161

Business Acquisition, Pro Forma Information [Table Text Block]

	Year Ende d
	December 31, 201 6

Revenu e	$	82,460
Operating incom e	$	4,061
Net income attributable to Ultralif e	$	3,821
Earnings per share :
Basi c	$	0.25
Dilute d	$	0.25

Note 4 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31,
	201 7		201 6
Raw M aterials	$	14,606	$	14,482
Work in P rocess		2,013		986
Finished P roducts		9,707		7,988
Total	$	26,326	$	23,456

Property, Plant and Equipment [Table Text Block]

	December 31,
	201 7			201 6
Land	$	123		$	123
Buildings and Leasehold I mprovements		7,858			7,757
Machinery and E quipment		50,852			49,722
Furniture and F ixtures		2,005			1,947
Computer Hardware and S oftware		5,338			5,223
Construction in P rogress		535			421
		66,711			65,193
Less – Accumulated Depreciation		(59,141	)		(57,194	)
Total	$	7,570		$	7,999

Schedule of Goodwill [Table Text Block]

	Battery & Energy Products			Communi- cations Systems		Total
Balance – January 1, 2016	$	4,790		$	11,493	$	16,283
Acquisition of Accutronics		4,487			-		4,487
Effect of Foreign Currency T ranslation		(805	)		-		(805	)
Balance – December 31, 2016		8,472			11,493		19,965
Effect of Foreign Currency T ranslation		493			-		493
Balance – December 31, 2017	$	8,965		$	11,493	$	20,458

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	December 31, 201 7
	Cost		Accumulated Amortization		Net
Trademarks	$	3,411	$	-	$	3,411
Customer R elationships		6,618		4,208		2,410
Patents and T echnology		5,545		4,595		950
Distributor R elationships		377		377		-
Trade Name		393		79		314
Total Other Intangible A ssets	$	16,344	$	9,259	$	7,085

	December 31, 201 6
	Cost		Accumulated Amortization		Net
Trademarks	$	3,404	$	-	$	3,404
Customer R elationships		6,395		3,975		2,420
Patents and T echnology		5,455		4,417		1,038
Distributor R elationships		377		368		9
Trade Name		359		36		323
Total Other Intangible A ssets	$	15,990	$	8,796	$	7,194

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

	Year ended December 31,
	201 7		201 6
Research and Development Expense	$	165	$	200
Selling, General and Administrative E xpense		257		303
Total	$	422	$	503

Note 8 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	201 7		201 6
Stock O ptions	$	642	$	676
Restricted Stock Grants		11		34
Total	$	653	$	710

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Years Ended December 31,
	201 7			201 6
Risk-free interest rate		1.7	%		1.4	%
Volatility factor		50.0	%		48.2	%
Weighted average expected life (years)		5.0			4.8
Forfeiture rate		10.0	%		10.0	%
Dividends		0.0	%		0.0	%

Share-based Compensation, Stock Options, Activity [Table Text Block]

Year Ended December 31, 201 7
	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Shares under Option – January 1		2,323,581		$	6.22
Options Granted		244,750			5.60
Options Exercised		(333,305	)		4.29
Options Forfeited or Expired		(374,815	)		8.11
Shares under option – December 31		1,860,211		$	5.06		2.93	$	2,624
Vested and Expected to Vest - December 31		1,649,594		$	4.63		2.75	$	2,438

Options Exercisable – December 31		1,045,798		$	4.18		2.63	$	1,806

Year Ended December 31, 201 6
	Number of Shares			Weighted Average Exercise Price Per Share
Shares under O ption – January 1		2,257,969		$	6.30
Options G ranted		369,550			4.69
Options E xercised		(152,789	)		3.86
Options Forfeited or E xpired		(151,149	)		6.09
Shares under option – December 31		2,323,581		$	6.22

Options E xercisable – December 31		1,302,390		$	5.05

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Option O utstanding						Options E xercisable
Range of Exercise Prices			Number of Outstanding Options – December 31, 2017		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Number of Options Exercisable at December 31, 201 7		Weighted- Average Exercise Price
$3.22	-	$3.99		435,398		3.28	$	3.78		368,406	$	3.80
$4.00	-	$4.99		510,213		3.27		4.37		335,624		4.40
$5.00	-	$9.99		614,600		5.56		5.69		341,768		5.77
$10.00	-	$15.00		300,000		2.00		12.50		-		-

$3.22	-	$15.00		1,860,211		2.93	$	5.06		1,045,798	$	4.18

Note 9 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Years Ended December 31,
	201 7			201 6
Current:
Federal	$	-		$	(70	)
State		-			20
Foreign		300			13
		300			(37	)
Deferred:
Federal		(1,717	)		220
State		55			-
Foreign		(7	)		(85	)
		(1,669	)		135
Total income tax provision	$	(1,369	)	$	98

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	Years Ended December 31,
	2017			2016
Deferred Tax Liabilities:
Property, Plant and Equipment	$	-		$	-
Other		38			-
Intangible Assets		3,806			5,471
Total Deferred Tax Liabilities		3,844			5,471

Deferred Tax Assets:
Property, Plant and Equipment		44			77
Net Operating Loss Carryforwards		17,870			27,127
Tax Credit Carryforwards		1,837			1,704
Intangible Assets		1,535			2,923
Accrued Expenses, Reserves and Other		1,359			1,527
Total Deferred Tax Assets		22,645			33,358
Valuation Allowance for Deferred Tax Assets		(22,636	)		(33,331	)
Net Deferred Tax Assets		9			27

Net Deferred Tax Liabilities	$	3,835		$	5,444

Schedule of Net Deferred Tax Liabilities [Table Text Block]

	Years Ended December 31,
	201 7			2016

Non-Current Deferred Tax Assets	$	32		$	94
Non-Current Deferred Tax Liabilities		(3,867	)		(5,538	)
	$	(3,835	)	$	(5,444	)

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Years Ended December 31,
	201 7		2016
United States	$	4,831	$	2,803
Foreign		1,464		777
	$	6,295	$	3,580

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Years Ended December 31,
	2017			2016

Statutory Income Tax Rate		34	%		34.0	%
(Increase) Decrease in Tax Provision Resulting From:
Equity Compensation		0.7			9.6
Income Tax Credits		(0.9	)		(6.2	)
Foreign Tax Rates		(3.8	)		(2.2	)
Release of Unrecognized Tax Benefits		-			-
Valuation Allowance		(20.9	)		(30	)
Excess Accrual		-			(5.2	)
Tax Rate Change		(30.8	)		-
Other		(0.1	)		2.7
Effective Income Tax Rate		(21.8	)%		2.7	%

Note 11 - Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Battery & Energy Products		Communications Systems		Corporate			Total
Revenue	$	69,789	$	15,742	$	-		$	85,531
Segment Contribution		19,659		6,573		(19,756	)		6,476
Interest Expense, Net						(183	)		(183	)
Miscellaneous						(2	)		(2	)
Income Tax Benefit						1,369			1,369
Non-Controlling Interest						(16	)		(16	)
Net Loss Attributable to Ultralife								$	7,648

Total Assets	$	44,720	$	32,169	$	20,297		$	97,186
Capital Expenditures	$	1,015	$	212	$	63		$	1,290
Goodwill	$	8,965	$	11,493	$	-		$	20,458
Depreciation and Amortization of Intangible Assets	$	1,830	$	430	$	167		$	2,427
Stock-Based Compensation	$	301	$	88	$	264		$	653

	Battery & Energy Products		Communications Systems		Corporate			Total
Revenue	$	64,753	$	17,707	$	-		$	82,460
Segment Contribution		19,580		5,528		(21,345	)		3,763
Interest Expense, Net						(263	)		(263	)
Miscellaneous						80			80
Income Tax Provision						(98	)		(98	)
Non-Controlling Interest						27			27
Net Income Attributable to Ultralife								$	3,509

Total Assets	$	39,691	$	32,021	$	13,032		$	84,744
Capital Expenditures	$	852	$	158	$	367		$	1,377
Goodwill	$	8,472	$	11,493	$	-		$	19,965
Depreciation and Amortization of Intangible Assets	$	2,042	$	541	$	143		$	2,726
Stock-Based Compensation	$	403	$	110	$	197		$	710

Revenue from External Customers by Geographic Areas [Table Text Block]

201 7 :	Total Revenue		United States			Non-United States
Battery & Energy Products	$	69,789	$	33,397		$	36,392
Communications Systems		15,742		14,217			1,525
Total	$	85,531	$	47,614		$	37,917
				56	%		44	%

2016:	Total Revenue		United States			Non-United States
Battery & Energy Products	$	64,753	$	29,587		$	35,166
Communications Systems		17,707		15,507			2,200
Total	$	82,460	$	45,094		$	37,366
				55	%		45	%

Schedule of Revenues from External Customers by Business Segment Sector [Table Text Block]

201 7 :	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	69,789	$	40,790		$	28,999
Communications Systems		15,742		-			15,742
Total	$	85,531	$	40,790		$	44,741
				48	%		52	%

201 6 :	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	64,753	$	40,886		$	23,867
Communications Systems		17,707		-			17,707
Total	$	82,460	$	40,886		$	41,574
				50	%		50	%

Note 1 - Summary of Operations and Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 02, 2017 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Allowance for Doubtful Accounts Receivable, Current		$ 292	$ 277
Foreign Currency Transaction Gain (Loss), before Tax		(10)	86
Advertising Expense		26	32
Research and Development Expense, Gross		5,142	6,155
Customer Funded Research and Development Expense Included in Cost of Goods Sold		405	209
Research and Development, Revenue		$ 405	$ 209
Number of Dilutive Stock Options Included in Diluted Earnings Per Share Calculation \| shares		1,035,711	1,238,804
Number of Shares Due to Dilutive Stock Options Included in Diluted Earnings Per Share Calculation \| shares		330,676	135,458
Number of Dilutive Restricted Stock Units Included in Diluted EarningsPerShareCalculation \| shares			15,900
Number of Shares Due to Dilutive Restricted Stock Units Included in Diluted Earnings Per Share Calculation \| shares			9,538
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares		824,500	1,332,281
Number of Operating Segments		2
Deferred Tax Assets, Gross		$ 22,645	$ 33,358
Deferred Tax Assets, Valuation Allowance		$ 22,636	$ 33,331
Reclassification of Current Deferred Tax Assets to Noncurrent [Member] \| December 31, 2017 [Member]
Prior Period Reclassification Adjustment	$ 32
Reclassification of Current Deferred Tax Assets to Noncurrent [Member] \| December 31, 2016 [Member]
Prior Period Reclassification Adjustment	94
Current Period Reclassification Adjustment	94
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Gross	1,123
Deferred Tax Assets, Valuation Allowance	$ 1,123
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number \| shares		0
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Number of Major Customers		1	1
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Large Defense Primary Contractor, 1 [Member]
Concentration Risk, Percentage		18.00%	12.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Large Defense Primary Contractor, 2 [Member]
Concentration Risk, Percentage		3.00%	13.00%

Note 1 - Summary of Operations and Significant Accounting Policies - Property, Plant and Equipment Estimated Useful Life (Details)	12 Months Ended
	Dec. 31, 2017
Building [Member] \| Minimum [Member]
Estimated useful lives (Year)	10 years
Building [Member] \| Maximum [Member]
Estimated useful lives (Year)	20 years
Machinery and Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	5 years
Machinery and Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	10 years
Furniture and Fixtures [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Estimated useful lives (Year)	10 years
Computer Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Computer Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	5 years
Leasehold Improvements [Member]
Leasehold Improvements	Lesser of useful life or lease term

Note 2 - Acquisition (Details Textual) - Accutronics Limited [Member] £ in Thousands, $ in Thousands					12 Months Ended
	Feb. 24, 2016 USD ($)	Feb. 24, 2016 GBP (£)	Jan. 13, 2016 USD ($)	Jan. 13, 2016 GBP (£)	Dec. 31, 2016 USD ($)
Payments to Acquire Businesses, Gross			$ 10,976	£ 7,575
Payments to Acquire Businesses, Net of Cash Acquired Working Capital Adjustment \| £		£ 133
Business Combination, Consideration Transferred	$ 11,161	£ 7,708
Business Combination, Adjustment, Intangible Assets	(402)
Business Combination, Adjustment, Property, Plant, and Equipment	99
Business Combination, Adjustment, Prepaids and Other Current Assets	291
Business Combination, Adjustment, Inventory	75
Business Combination, Adjustment, Deferred Income Taxes on Intangible Assets	113
Business Combination, Adjustment, Goodwill	$ 104
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 4,374
Business Combination, Acquisition Related Costs					$ 251
Inventory Adjustments					96
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					10,362
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					$ 436
Minimum [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years	10 years
Maximum [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years	15 years
Customer Contracts and Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 2,821
Intellectual Property [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	1,132
Trade Names [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 421

Note 2 - Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Jan. 13, 2016	Dec. 31, 2015
Goodwill	$ 20,458	$ 19,965		$ 16,283
Accutronics Limited [Member]
Cash			$ 1,304
Accounts Receivable			1,344
Inventory			2,167
Prepaids and Other Current Assets			584
Property, Plant & Equipment			269
Identifiable Intangible Assets			4,374
Goodwill			4,487
Accounts Payable			(1,009)
Accrued Expenses			(1,136)
Income Taxes Payable			(111)
Non-Current Liabilities			(209)
Deferred Income Taxes			(74)
Deferred Income Taxes on Intangible Assets			(829)
Total Consideration			$ 11,161

Note 2 - Acquisition - Unaudited Pro Forma Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares
Revenue	$ 82,460
Operating income	4,061
Net income attributable to Ultralife	$ 3,821
Basic (in dollars per share) \| $ / shares	$ 0.25
Diluted (in dollars per share) \| $ / shares	$ 0.25

Note 3 - Share Repurchase Program (Details Textual) - USD ($) $ in Thousands	12 Months Ended		25 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 02, 2016	May 01, 2014
Treasury Stock, Shares, Acquired		156,092	2,592,095
Treasury Stock, Value, Acquired, Cost Method	$ 26	$ 635	$ 10,480
Share Repurchase Program [Member]
Treasury Stock, Shares, Acquired		149,904
Treasury Stock, Value, Acquired, Cost Method		$ 603
Maximum [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			3,400,000	1,800,000

Note 4 - Supplemental Balance Sheet Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Construction in Progress, Gross	$ 5,136	$ 170
Depreciation	2,005	2,223
Goodwill, Impairment Loss	0	0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	400
Finite-Lived Intangible Assets, Amortization Expense, Year Two	379
Finite-Lived Intangible Assets, Amortization Expense, Year Three	367
Finite-Lived Intangible Assets, Amortization Expense, Year Four	348
Finite-Lived Intangible Assets, Amortization Expense, Year Five	334
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0	$ 0

Note 4 - Supplemental Balance Sheet Information - Components of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Raw Materials	$ 14,606	$ 14,482
Work in Process	2,013	986
Finished Products	9,707	7,988
Total	$ 26,326	$ 23,456

Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment, gross	$ 66,711	$ 65,193
Less – Accumulated Depreciation	(59,141)	(57,194)
Total	7,570	7,999
Land [Member]
Property, plant and equipment, gross	123	123
Building and Building Improvements [Member]
Property, plant and equipment, gross	7,858	7,757
Machinery and Equipment [Member]
Property, plant and equipment, gross	50,852	49,722
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,005	1,947
Computer Equipment [Member]
Property, plant and equipment, gross	5,338	5,223
Construction in Progress [Member]
Property, plant and equipment, gross	$ 535	$ 421

Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill balance	$ 19,965	$ 16,283
Effect of Foreign Currency Translation	493	(805)
Goodwill balance	20,458	19,965
Accutronics Limited [Member]
Acquisition of Accutronics		4,487
Battery & Energy Products Segment [Member]
Goodwill balance	8,472	4,790
Effect of Foreign Currency Translation	493	(805)
Goodwill balance	8,965	8,472
Battery & Energy Products Segment [Member] \| Accutronics Limited [Member]
Acquisition of Accutronics		4,487
Communications Systems Segment [Member]
Goodwill balance	11,493	11,493
Effect of Foreign Currency Translation
Goodwill balance	$ 11,493	11,493
Communications Systems Segment [Member] \| Accutronics Limited [Member]
Acquisition of Accutronics

Note 4 - Supplemental Balance Sheet - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Cost	$ 16,344	$ 15,990
Accumulated Amortization	9,259	8,796
Net	7,085	7,194
Trademarks [Member]
Cost	3,411	3,404
Accumulated Amortization	0
Net	3,411	3,404
Customer Relationships [Member]
Cost	6,618	6,395
Accumulated Amortization	4,208	3,975
Net	2,410	2,420
Patented Technology [Member]
Cost	5,545	5,455
Accumulated Amortization	4,595	4,417
Net	950	1,038
Distributor Relationships [Member]
Cost	377	377
Accumulated Amortization	377	368
Net		9
Trade Names [Member]
Cost	393	359
Accumulated Amortization	79	36
Net	$ 314	$ 323

Note 4 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Amortization of Intangible Assets	$ 422	$ 503
Research and Development Expense [Member]
Amortization of Intangible Assets	165	200
Selling, General and Administrative Expenses [Member]
Amortization of Intangible Assets	$ 257	$ 303

Note 5 - Operating Leases - Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2017 USD ($)
2018	$ 558
2019	416
2020	100
2021
2022

Note 6 - Debt (Details Textual) $ in Thousands		10 Months Ended	12 Months Ended
Note 6 - Debt (Details Textual) $ in Thousands	May 31, 2017 USD ($)	Apr. 01, 2018	Dec. 31, 2017 USD ($)
KeyBank [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 30,000
Line of Credit Facility Maximum Borrowing Capacity May Be Increased to	50,000
Long-term Line of Credit			$ 0
Minimum Fixed Charge Coverage Ratio			1.15
Minimum Tangible Net Worth			$ 40,000
Letters of Credit Outstanding, Amount			0
KeyBank [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Scenario, Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate		1.85%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.20%
KeyBank [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member] \| Scenario, Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate		(0.50%)
KeyBank [Member] \| Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500
PNC Bank [Member] \| Revolving Credit Facility [Member]
Long-term Line of Credit			$ 0

Note 6 - Debt - Interest Rate Margins (Details) - KeyBank [Member] - Revolving Credit Facility [Member] - Scenario, Forecast [Member]	10 Months Ended	26 Months Ended
	Apr. 01, 2018	May 30, 2020
Leverage Ratio Less Than 1.5 [Member]
Applicable basis points for unused fee		0.20%
Leverage Ratio Between 1.5 and 2.5 [Member]
Applicable basis points for unused fee		0.15%
Leverage Ratio Greater than 2.5 [Member]
Applicable basis points for unused fee		0.10%
London Interbank Offered Rate (LIBOR) [Member]
Interest rate margin on outstanding borrowings	1.85%
Applicable basis points for unused fee	0.20%
London Interbank Offered Rate (LIBOR) [Member] \| Leverage Ratio Less Than 1.5 [Member]
Interest rate margin on outstanding borrowings		1.85%
London Interbank Offered Rate (LIBOR) [Member] \| Leverage Ratio Between 1.5 and 2.5 [Member]
Interest rate margin on outstanding borrowings		2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Leverage Ratio Greater than 2.5 [Member]
Interest rate margin on outstanding borrowings		2.15%
Base Rate [Member]
Interest rate margin on outstanding borrowings	(0.50%)
Base Rate [Member] \| Leverage Ratio Less Than 1.5 [Member]
Interest rate margin on outstanding borrowings		(0.50%)
Base Rate [Member] \| Leverage Ratio Between 1.5 and 2.5 [Member]
Interest rate margin on outstanding borrowings		(0.25%)
Base Rate [Member] \| Leverage Ratio Greater than 2.5 [Member]
Interest rate margin on outstanding borrowings		0.00%

Note 7 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 04, 2015	Dec. 31, 2017
Loss Contingency, Damages Sought, Value	$ 42,000
Capital Addition Purchase Commitments [Member]
Long-term Purchase Commitment, Amount		$ 1,392

Note 7 - Commitments and Contingencies - Changes in Produce Warranty Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accrued Warranty Obligation, Beginning	$ 172	$ 192
Provision (reversal) for warranties issued	84	39
Settlements made	(107)	(59)
Accrued Warranty Obligations – Ending	$ 149	$ 172

Note 8 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 03, 2011	Dec. 30, 2010	Sep. 30, 2017	Jun. 30, 2014	Jul. 02, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015	Jun. 30, 2004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number						1,860,211	2,323,581		2,257,969
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						244,750	369,550
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price						$ 5.60	$ 4.69
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options						$ 385
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value						$ 2.47	$ 2.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 588	$ 149
Proceeds from Stock Options Exercised						1,429	460
Allocated Share-based Compensation Expense						653	710
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options						$ 0
Common Stock, Capital Shares Reserved for Future Issuance						946,027
Employee Stock Option [Member]
Allocated Share-based Compensation Expense						$ 642	$ 676
Employee Stock Option [Member] \| President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost					$ 193
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						0	0
Restricted Stock [Member]
Allocated Share-based Compensation Expense						$ 11	$ 34
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			12,900
Stock Repurchased During Period, Shares			3,959
The 2004 Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						2,900,000				750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number						1,116,083
The 2004 Long-term Incentive Plan [Member] \| President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 6.58
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares	12,500
The 2004 Long-term Incentive Plan [Member] \| Options I [Member] \| President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 6.42
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares		12,500
The 2004 Long-term Incentive Plan [Member] \| Options II [Member] \| President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		250,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 6.42
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares		62,500
The 2004 Long-term Incentive Plan [Member] \| Options III [Member] \| President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		200,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 10
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares		50,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Share Price		$ 10
The 2004 Long-term Incentive Plan [Member] \| Options IV [Member] \| President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		200,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 15
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares		50,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Share Price		$ 15
The 2014 Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						1,750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number						744,128
The 2014 Long-term Incentive Plan [Member] \| Awards Other than Stock Options and SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				800,000
The 2014 Long-term Incentive Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								3 years
Stock Issued During Period, Shares, Restricted Stock Award, Gross								49,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value								$ 3.24
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				7 years

Note 8 - Shareholders' Equity - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Stock-based comepensation expense	$ 653	$ 710
Employee Stock Option [Member]
Stock-based comepensation expense	642	676
Restricted Stock [Member]
Stock-based comepensation expense	$ 11	$ 34

Note 8 - Shareholders' Equity - Stock Option Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Risk-free interest rate	1.70%	1.40%
Volatility factor	50.00%	48.20%
Weighted Average Expected Life (Year)	5 years	4 years 292 days
Forfeiture rate	10.00%	10.00%
Dividends	0.00%	0.00%

Note 8 - Shareholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Shares under Option, beginning of period (in shares)	2,323,581	2,257,969
Options outstanding - weighted average exercise price (in dollars per share)	$ 6.22	$ 6.30
Options Granted (in shares)	244,750	369,550
Options granted - weighted average exercise price (in dollars per share)	$ 5.60	$ 4.69
Options Exercised (in shares)	(333,305)	(152,789)
Options exercised - weighted average exercise price (in dollars per share)	$ 4.29	$ 3.86
Options Forfeited or Expired (in shares)	(374,815)	(151,149)
Options forfeited or expired - weighted average exercise price (in dollars per share)	$ 8.11	$ 6.09
Shares under option, end of period (in shares)	1,860,211	2,323,581
Options outstanding - weighted average exercise price (in dollars per share)	$ 5.06	$ 6.22
Options outstanding - weighted average remaining contractual term (Year)	2 years 339 days
Options outstanding - aggregate intrinsic value	$ 2,624
Vested and Expected to Vest (in shares)	1,649,594
Options vested and expected to vest - weighted average exercise price (in dollars per share)	$ 4.63
Options vested and expected to vest - weighted average remaining contractual term (Year)	2 years 273 days
Options vested and expected to vest - aggregate intrinsic value	$ 2,438
Options Exercisable (in shares)	1,045,798	1,302,390
Options exercisable, weighted-average exercise price (in dollars per share)	$ 4.18
Options exercisable - weighted average remaining contractual term (Year)	2 years 229 days
Options exercisable - aggregate intrinsic value	$ 1,806
Options exercised - weighted average exercise price (in dollars per share)	$ 4.29	$ 3.86
Options forfeited or expired (in shares)	(374,815)	(151,149)
Options forfeited or expired - weighted average exercise price (in dollars per share)	$ 8.11	$ 6.09
Options exercisable (in shares)	1,045,798	1,302,390
Options exercisable - weighted average exercise price (in dollars per share)		$ 5.05

Note 8 - Shareholders' Equity - Options Range of Exercise Prices (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Lower range limit (in dollars per share)	$ 3.22
Upper range limit (in dollars per share)	$ 15
Options outstanding, number of outstanding options (in shares) \| shares	1,860,211
Options outstanding, weighted-average remaining contractual life (Year)	2 years 339 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.06
Options exercisable, number of options exercisable (in shares) \| shares	1,045,798
Options exercisable, weighted-average exercise price (in dollars per share)	$ 4.18
Range One [Member]
Lower range limit (in dollars per share)	3.22
Upper range limit (in dollars per share)	$ 3.99
Options outstanding, number of outstanding options (in shares) \| shares	435,398
Options outstanding, weighted-average remaining contractual life (Year)	3 years 102 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 3.78
Options exercisable, number of options exercisable (in shares) \| shares	368,406
Options exercisable, weighted-average exercise price (in dollars per share)	$ 3.80
Range Two [Member]
Lower range limit (in dollars per share)	4
Upper range limit (in dollars per share)	$ 4.99
Options outstanding, number of outstanding options (in shares) \| shares	510,213
Options outstanding, weighted-average remaining contractual life (Year)	3 years 98 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 4.37
Options exercisable, number of options exercisable (in shares) \| shares	335,624
Options exercisable, weighted-average exercise price (in dollars per share)	$ 4.40
Range Three [Member]
Lower range limit (in dollars per share)	5
Upper range limit (in dollars per share)	$ 9.99
Options outstanding, number of outstanding options (in shares) \| shares	614,600
Options outstanding, weighted-average remaining contractual life (Year)	5 years 204 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.69
Options exercisable, number of options exercisable (in shares) \| shares	341,768
Options exercisable, weighted-average exercise price (in dollars per share)	$ 5.77
Range Four [Member]
Lower range limit (in dollars per share)	10
Upper range limit (in dollars per share)	$ 15
Options outstanding, number of outstanding options (in shares) \| shares	300,000
Options outstanding, weighted-average remaining contractual life (Year)	2 years
Options outstanding, weighted-average exercise price (in dollars per share)	$ 12.50
Options exercisable, number of options exercisable (in shares) \| shares
Options exercisable, weighted-average exercise price (in dollars per share)

Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 02, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		34.00%	34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ (1,939)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		(10,695)	$ (1,262)
Deferred Tax Assets, Gross		22,645	33,358
Unrecognized Tax Benefits		0	0
Deferred Tax Assets, Valuation Allowance		22,636	$ 33,331
Domestic Tax Authority [Member]
Operating Loss Carryforwards		69,594
Tax Credit Carryforward, Amount		$ 1,837
Domestic Tax Authority [Member] \| Earliest Tax Year [Member] \| Internal Revenue Service (IRS) [Member]
Open Tax Year		2002
Domestic Tax Authority [Member] \| Latest Tax Year [Member] \| Internal Revenue Service (IRS) [Member]
Open Tax Year		2017
Foreign Tax Authority [Member]
Operating Loss Carryforwards		$ 12,760
Foreign Tax Authority [Member] \| Earliest Tax Year [Member]
Open Tax Year		2009
Foreign Tax Authority [Member] \| Latest Tax Year [Member]
Open Tax Year		2017
State and Local Jurisdiction [Member] \| Earliest Tax Year [Member]
Open Tax Year		2002
State and Local Jurisdiction [Member] \| Latest Tax Year [Member]
Open Tax Year		2017
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Gross				$ 1,123
Deferred Tax Assets, Valuation Allowance				$ 1,123
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%

Note 9 - Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Federal		$ (70)
State		20
Foreign	300	13
Total current tax provision	300	(37)
Federal	(1,717)	220
State	55
Foreign	(7)	(85)
Total deferred tax provision (benefit)	(1,669)	135
Total income tax provision	$ (1,369)	$ 98

Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Liabilities:
Property, Plant and Equipment
Other	38
Intangible Assets	3,806	5,471
Total Deferred Tax Liabilities	3,844	5,471
Deferred Tax Assets:
Property, Plant and Equipment	44	77
Net Operating Loss Carryforwards	17,870	27,127
Tax Credit Carryforwards	1,837	1,704
Intangible Assets	1,535	2,923
Accrued Expenses, Reserves and Other	1,359	1,527
Total Deferred Tax Assets	22,645	33,358
Valuation Allowance for Deferred Tax Assets	(22,636)	(33,331)
Net Deferred Tax Assets	9	27
Net Deferred Tax Liabilities	$ 3,835	$ 5,444

Note 9 - Income Taxes - Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-Current Deferred Tax Assets	$ 32	$ 94
Non-Current Deferred Tax Liabilities	(3,867)	(5,538)
Net Deferred Tax Liabilities	$ (3,835)	$ (5,444)

Note 9 - Income Taxes - United States and Foreign Income (Loss) From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
United States	$ 4,831	$ 2,803
Foreign	1,464	777
Income Before Income Taxes	$ 6,295	$ 3,580

Note 9 - Income Taxes - Effective Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statutory Income Tax Rate	34.00%	34.00%
Equity Compensation	0.70%	9.60%
Income Tax Credits	(0.90%)	(6.20%)
Foreign Tax Rates	(3.80%)	(2.20%)
Release of Unrecognized Tax Benefits
Valuation Allowance	(20.90%)	(30.00%)
Excess Accrual		(5.20%)
Tax Rate Change	(30.80%)
Other	(0.10%)	2.70%
Effective Income Tax Rate	(21.80%)	2.70%

Note 10 - 401(k) Retirement Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Maximum Employee Contribution Percentage, Subject to Employer Matching Contribution	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 181	$ 191

Note 11 - Business Segment Information (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of Operating Segments	2
Non-US [Member]
Long-Lived Assets	$ 12,443	$ 11,652

Note 11 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue	$ 85,531	$ 82,460
Segment Contribution	6,476	3,763
Interest Expense, Net	(183)	(263)
Miscellaneous	(2)	(80)
Income Tax Benefit	1,369	(98)
Non-Controlling Interest	(16)	27
Net Loss Attributable to Ultralife	7,648	3,509
Total Assets	97,186	84,744
Capital Expenditures	1,290	1,377
Goodwill	20,458	19,965	$ 16,283
Depreciation and Amortization of Intangible Assets	2,427	2,726
Stock-Based Compensation	653	710
Miscellaneous	2	80
Battery & Energy Products Segment [Member]
Revenue	69,789	64,753
Segment Contribution	19,659	19,580
Interest Expense, Net
Miscellaneous
Income Tax Benefit
Non-Controlling Interest
Net Loss Attributable to Ultralife
Total Assets	44,720	39,691
Capital Expenditures	1,015	852
Goodwill	8,965	8,472	4,790
Depreciation and Amortization of Intangible Assets	1,830	2,042
Stock-Based Compensation	301	403
Miscellaneous
Communications Systems Segment [Member]
Revenue	15,742	17,707
Segment Contribution	6,573	5,528
Interest Expense, Net
Miscellaneous
Income Tax Benefit
Non-Controlling Interest
Net Loss Attributable to Ultralife
Total Assets	32,169	32,021
Capital Expenditures	212	158
Goodwill	11,493	11,493	$ 11,493
Depreciation and Amortization of Intangible Assets	430	541
Stock-Based Compensation	88	110
Miscellaneous
Corporate Segment [Member]
Revenue
Segment Contribution	(19,756)	(21,345)
Interest Expense, Net	(183)	(263)
Miscellaneous	(2)	(80)
Income Tax Benefit	1,369	(98)
Non-Controlling Interest	(16)	27
Net Loss Attributable to Ultralife
Total Assets	20,297	13,032
Capital Expenditures	63	367
Goodwill
Depreciation and Amortization of Intangible Assets	167	143
Stock-Based Compensation	264	197
Miscellaneous	$ 2	$ 80

Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 85,531	$ 82,460
Revenue, percentage
UNITED STATES
Revenue	$ 47,614	$ 45,094
Revenue, percentage	56.00%	55.00%
Non-US [Member]
Revenue	$ 37,917	$ 37,366
Revenue, percentage	44.00%	45.00%
Battery & Energy Products Segment [Member]
Revenue	$ 69,789	$ 64,753
Battery & Energy Products Segment [Member] \| UNITED STATES
Revenue	33,397	29,587
Battery & Energy Products Segment [Member] \| Non-US [Member]
Revenue	36,392	35,166
Communications Systems Segment [Member]
Revenue	15,742	17,707
Communications Systems Segment [Member] \| UNITED STATES
Revenue	14,217	15,507
Communications Systems Segment [Member] \| Non-US [Member]
Revenue	$ 1,525	$ 2,200

Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 85,531	$ 82,460
Revenue, percentage
Commercial [Member]
Revenue	$ 40,790	$ 40,886
Revenue, percentage	48.00%	50.00%
Government & Defense [Member]
Revenue	$ 44,741	$ 41,574
Revenue, percentage	52.00%	50.00%
Battery & Energy Products Segment [Member]
Revenue	$ 69,789	$ 64,753
Battery & Energy Products Segment [Member] \| Commercial [Member]
Revenue	40,790	40,886
Battery & Energy Products Segment [Member] \| Government & Defense [Member]
Revenue	28,999	23,867
Communications Systems Segment [Member]
Revenue	15,742	17,707
Communications Systems Segment [Member] \| Commercial [Member]
Revenue
Communications Systems Segment [Member] \| Government & Defense [Member]
Revenue	$ 15,742	$ 17,707

Note 10 - 401(k) Retirement Benefit Plan	12 Months Ended
Note 10 - 401(k) Retirement Benefit Plan	Dec. 31, 2017
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	Note 10 - 401 (k) Retirement Benefit Plan We maintain a defined contribution 401 (k) plan covering substantially all employees. Employees can contribute a portion of their salary or wages as prescribed under Section 401 (k) of the Internal Revenue Code and, subject to certain limitations, we may, at the discretion of our Board of Directors, authorize an employer contribution based on a portion of the employees' contributions. Since January 2010, we have matched 50% on the first 4% contributed by an employee, or a maximum of 2% of the employee’s income. For 2017 and 2016, we contributed $181 and $191, respectively, to the 401 (k) plan.

Note 5 - Operating Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense, Net	$ 660	$ 668