0001437749-26-009385 | 10-K | XBRL Viewer

Supplemental Balance Sheet Disclosures [Text Block]

Note 4 - Supplemental Balance Sheet Information

a.	Cash and Restricted Cash

The composition of the Company’s cash was as follows.

	December 31,
	2025		2024
Cash	$	9,345	$	6,854

b.	Inventory, Net

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,
	2025		2024
Raw materials	$	42,150	$	36,035
Work in process	4,045			4,501
Finished products	7,813			10,827
Total	$	54,008	$	51,363

c.	Property, Plant and Equipment

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

	December 31,
	2025			2024
Land	$	4,693		$	4,693
Buildings and leasehold improvements		30,179			30,109
Machinery and equipment		63,556			60,986
Furniture and fixtures		3,195			3,067
Computer hardware and software		8,164			7,990
Construction in progress		3,129			2,077
		112,916			108,922
Less: Accumulated depreciation		(72,519	)		(68,437	)
Total	$	40,397		$	40,485

Depreciation expense was $3,981 and $3,125 for the years ended December 31, 2025, and 2024, respectively.

d.	Goodwill and Other Intangible Assets

The Company conducted its annual impairment test for goodwill and other indefinite-lived intangible assets as of October 1, 2025. We identified two (2) goodwill reporting units and five (5) indefinite-lived intangible assets for trademarks and trade names. We performed a quantitative impairment assessment of each goodwill reporting unit and indefinite-lived intangible asset. Based on the results of our quantitative impairment assessment, and consideration of qualitative factors, as of our test date and December 31, 2025, no impairments were identified with respect to goodwill, and it was concluded that our trademarks and trade names were fully impaired as a result of the Company’s global rebranding initiative to consolidate all sub-brands under a singular, unified master brand – Ultralife, which launched during the fourth quarter of 2025.

The following table summarizes the goodwill activity by segment for the years ended December 31, 2025, and 2024:

	Battery & Energy Products		Communications Systems		Total
Balance – January 1, 2025	$	33,513	$	11,493	$	45,006
Effect of foreign currency translation		370		-		370
Balance – December 31, 2025	$	33,883	$	11,493	$	45,376

The composition of intangible assets was:

	December 31, 2025
	Cost		Accumulated amortization		Net
Customer relationships	$	18,333	$	8,360	$	9,973
Patents and technology		5,762		5,635		127
Other		1,500		667		833
Trade names		-		-		-
Trademarks		-		-		-
Total other intangible assets	$	25,595	$	14,662	$	10,933

	December 31, 2024
	Cost		Accumulated amortization		Net
Customer relationships	$	18,154	$	7,296	$	10,858
Patents and technology		5,690		5,428		262
Other		1,500		591		909
Trade names		9,942		813		9,129
Trademarks		3,399		-		3,399
Total other intangible assets	$	38,685	$	14,128	$	24,557

The change in the cost value of other intangible assets is primarily the result of the impairment of our trademarks and trade names during the year ended December 31, 2025 as a result of the Company’s rebranding initiative, as well as the effect of foreign currency translations.

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

	Year ended December 31,
	2025		2024
Selling, general and administrative expense	$	1,395	$	929
Research and development expense		123		103
Total	$	1,518	$	1,032

Future amortization expense of amortizable intangible assets will be approximately $1,066, $1,066, $1,066, $1,046 and $1,029 for the five fiscal years ending December 31, 2026, through 2030, respectively.

Note 4 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2025

Cash, Cash Equivalent, and Investment [Table Text Block]

	December 31,
	2025		2024
Cash	$	9,345	$	6,854

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2025		2024
Raw materials	$	42,150	$	36,035
Work in process	4,045			4,501
Finished products	7,813			10,827
Total	$	54,008	$	51,363

Property, Plant and Equipment [Table Text Block]

	December 31,
	2025			2024
Land	$	4,693		$	4,693
Buildings and leasehold improvements		30,179			30,109
Machinery and equipment		63,556			60,986
Furniture and fixtures		3,195			3,067
Computer hardware and software		8,164			7,990
Construction in progress		3,129			2,077
		112,916			108,922
Less: Accumulated depreciation		(72,519	)		(68,437	)
Total	$	40,397		$	40,485

Schedule of Goodwill [Table Text Block]

	Battery & Energy Products		Communications Systems		Total
Balance – January 1, 2025	$	33,513	$	11,493	$	45,006
Effect of foreign currency translation		370		-		370
Balance – December 31, 2025	$	33,883	$	11,493	$	45,376

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

	December 31, 2025
	Cost		Accumulated amortization		Net
Customer relationships	$	18,333	$	8,360	$	9,973
Patents and technology		5,762		5,635		127
Other		1,500		667		833
Trade names		-		-		-
Trademarks		-		-		-
Total other intangible assets	$	25,595	$	14,662	$	10,933

	December 31, 2024
	Cost		Accumulated amortization		Net
Customer relationships	$	18,154	$	7,296	$	10,858
Patents and technology		5,690		5,428		262
Other		1,500		591		909
Trade names		9,942		813		9,129
Trademarks		3,399		-		3,399
Total other intangible assets	$	38,685	$	14,128	$	24,557

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

	Year ended December 31,
	2025		2024
Selling, general and administrative expense	$	1,395	$	929
Research and development expense		123		103
Total	$	1,518	$	1,032

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

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Note 10 - Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2025

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

	Battery & Energy Products			Communications Systems			Corporate			Total
Revenue	$	178,042		$	13,117		$	-		$	191,159
Cost of products sold		(135,402	)		(9,736	)		-			(145,138	)
Gross profit		42,640			3,381			-			46,021
Direct R&D and SG&A expenses		(22,417	)		(4,671	)		-			(27,088	)
Segment contribution		20,223			(1,290	)		-			18,933
Corporate G&A expenses		-			-			(24,835	)		(24,835	)
Operating loss											(5,902	)
Other expense, net								(2,496	)		(2,496	)
Income tax provision								2,447			2,447
Non-controlling interest								53			53
Net loss attributable to Ultralife										$	(5,898	)

Total assets	$	165,592		$	27,201		$	24,119		$	216,912
Capital expenditures	$	3,872		$	-		$	-		$	3,872
Goodwill	$	33,883		$	11,493		$	-		$	45,376
Depreciation and amortization of intangible assets	$	5,115		$	231		$	153		$	5,499
Stock-based compensation	$	602		$	97		$	236		$	935

	Battery & Energy Products			Communications Systems			Corporate			Total
Revenue	$	144,081		$	20,375		$	-		$	164,456
Cost of products sold		(107,764	)		(14,378	)		-			(122,142	)
Gross profit		36,317			5,997			-			42,314
Direct R&D and SG&A expenses		(17,320	)		(4,806	)		-			(22,126	)
Segment contribution		18,997			1,191			-			20,188
Corporate G&A expenses		-			-			(10,223	)		(10,223	)
Operating profit											9,965
Other expense, net								(1,664	)		(1,664	)
Income tax provision								(1,892	)		(1,892	)
Non-controlling interest								(97	)		(97	)
Net income attributable to Ultralife										$	6,312

Total assets	$	173,954		$	26,876		$	19,621		$	220,451
Capital expenditures	$	1,261		$	513		$	158		$	1,932
Goodwill	$	33,513		$	11,493		$	-		$	45,006
Depreciation and amortization of intangible assets	$	3,676		$	237		$	244		$	4,157
Stock-based compensation	$	383		$	96		$	219		$	698

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

	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	178,042	$	125,295		$	52,747
Communications Systems		13,117		-			13,117
Total	$	191,159	$	125,295		$	65,864
				66	%		34	%

	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	144,081	$	102,082		$	41,999
Communications Systems		20,375		-			20,375
Total	$	164,456	$	102,082		$	62,374
				62	%		38	%

	Total Revenue		United States			Non-United States
Battery & Energy Products	$	178,042	$	125,903		$	52,139
Communications Systems		13,117		11,174			1,943
Total	$	191,159	$	137,077		$	54,082
				72	%		28	%

	Total Revenue		United States			Non-United States
Battery & Energy Products	$	144,081	$	82,227		$	61,854
Communications Systems		20,375		14,813			5,562
Total	$	164,456	$	97,040		$	67,416
				59	%		41	%

Note 5 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Balance	$ 45,006
Effect of foreign currency translation	370
Balance	45,376
Battery & Energy Products Segment [Member]
Balance	33,513
Effect of foreign currency translation	370
Balance	33,883
Communications Systems Segment [Member]
Balance	11,493
Effect of foreign currency translation	0
Balance	$ 11,493

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Note 2 - Acquisition - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Oct. 31, 2024
Goodwill	$ 45,376	$ 45,006
Electrochem Solutions, Inc. [Member]
Accounts receivable			$ 5,270
Inventories			9,172
Prepaid expenses and other current assets			251
Property, plant and equipment			20,735
Goodwill			7,558
Other intangible assets			10,500
Other noncurrent assets			237
Accounts payable			(2,231)
Accrued compensation and related benefits			(1,561)
Accrued expenses and other current liabilities			(904)
Deferred tax liability, net			(748)
Other noncurrent liabilities			(257)
Net assets acquired			$ 48,022

Note 4 - Supplemental Balance Sheet Information - Schedule of Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cash	$ 9,345	$ 6,854

Note 3 - Debt (Details Textual) - Amended Credit Agreement [Member] $ in Thousands	Dec. 13, 2021 USD ($)	Mar. 31, 2027	Dec. 31, 2026	Dec. 31, 2025 USD ($)	Mar. 31, 2025
Debt Issuance Costs, Gross				$ 599
Debt Instrument, Interest Rate, Effective Percentage				6.16%
Term Loan Facility [Member] \| Long-term Debt, Current Maturities [Member]
Secured Debt, Total				$ 4,125
Term Loan Facility [Member] \| KeyBank [Member]
Debt Instrument, Term	5 years
Debt Instrument, Face Amount	$ 55,000
Revolving Credit Facility [Member]
Secured Debt, Total				50,250
Long-Term Line of Credit, Total				0
Debt Issuance Costs, Gross				$ 414
Maximum Consolidated Senior Leverage Ratio				3.5	1.15
Revolving Credit Facility [Member] \| Forecast [Member]
Maximum Consolidated Senior Leverage Ratio		3	3.25

Note 2 - Acquisition - Schedule of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	Oct. 31, 2024	Dec. 31, 2025
Trade name		$ 1,066
Trade name		1,066
Trade name		1,066
Trade name		1,046
Trade name		$ 1,029
Electrochem Solutions, Inc. [Member]
Trade name	$ 10,500
Trade name	713
Trade name	713
Trade name	713
Trade name	713
Trade name	713
Electrochem Solutions, Inc. [Member] \| Trade Names [Member]
Trade name	$ 5,300
Trade name (Year)	15 years
Trade name	$ 353
Trade name	353
Trade name	353
Trade name	353
Trade name	353
Electrochem Solutions, Inc. [Member] \| Customer Relationships [Member]
Trade name	$ 5,100
Trade name (Year)	15 years
Trade name	$ 340
Trade name	340
Trade name	340
Trade name	340
Trade name	340
Electrochem Solutions, Inc. [Member] \| Patents and Technology [Member]
Trade name	$ 100
Trade name (Year)	5 years
Trade name	$ 20
Trade name	20
Trade name	20
Trade name	20
Trade name	$ 20

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Securing the Company's IT systems is integral and foundational to its everyday operations. The Company’s Security Steering Committee is comprised of cross-functional executive management team members that individually have expertise in their functional areas on a global basis and that collectively possess a high level of cybersecurity and technology operations expertise. The mission of our Security Steering Committee is to focus on defining and deploying its information security strategy, sustaining a robust employee cybersecurity awareness and training program, executing security engineering, providing continuous monitoring of the Company’s information security strategy, responding and coordinating the response and investigation of cyber threats, building and testing its disaster recovery plans in support of its businesses’ continuity plan requirements, and developing its cyber and information security policies. The Company's cybersecurity strategy is based on recognized best practices, standards, and frameworks for cybersecurity and information technology, including the Center for Information Security ("CIS") Controls and National Institute of Standards and Technology ("NIST"). The strategy focuses on implementing technologies, controls, and processes to constantly monitor, identify, assess, and manage cybersecurity risks. The Company’s cybersecurity program includes exercises and trainings designed to sustain a high level of cybersecurity awareness and readiness across our employee base. The Company also has a cybersecurity incident response plan that is designed to provide a framework across all functions for a coordinated identification and response to security incidents. The Company engages leading cybersecurity firms to assist with its security engineering and operations; provide independent evaluations of its security posture through regular assessments; and to audit and provide advice on how to make its security processes and controls more effective. The Company utilizes third-party service providers to perform a variety of functions to assist in operating its business. The cybersecurity risks associated with the use of certain providers are covered under a vendor management process. Depending on the nature of the services provided and the sensitivity and/or quantity of information processed, the vendor management process may include reviewing cybersecurity practices of these providers, contractually imposing obligations on the provider, inspecting independently audited reports, and/or conducting its own security assessments of their services.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Securing the Company's IT systems is integral and foundational to its everyday operations. The Company’s Security Steering Committee is comprised of cross-functional executive management team members that individually have expertise in their functional areas on a global basis and that collectively possess a high level of cybersecurity and technology operations expertise. The mission of our Security Steering Committee is to focus on defining and deploying its information security strategy, sustaining a robust employee cybersecurity awareness and training program, executing security engineering, providing continuous monitoring of the Company’s information security strategy, responding and coordinating the response and investigation of cyber threats, building and testing its disaster recovery plans in support of its businesses’ continuity plan requirements, and developing its cyber and information security policies.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]	The Company utilizes third-party service providers to perform a variety of functions to assist in operating its business. The cybersecurity risks associated with the use of certain providers are covered under a vendor management process. Depending on the nature of the services provided and the sensitivity and/or quantity of information processed, the vendor management process may include reviewing cybersecurity practices of these providers, contractually imposing obligations on the provider, inspecting independently audited reports, and/or conducting its own security assessments of their services.
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Company’s Board of Directors has ultimate oversight of the Company’s cybersecurity risk. Management updates the Board of Directors on the Company's cybersecurity and information security posture at least quarterly at the Company’s Board meetings, or more frequently as determined to be necessary or advisable. These updates include a review of cybersecurity incidents determined to have a moderate to high business impact, even if immaterial to the Company as a whole. The Audit Committee has responsibility for assisting the Board in the review and oversight of risks affecting the Company, and oversees the enterprise risk management process, which includes, with the assistance of senior management, assessing the Company’s exposure to cybersecurity risk and the effectiveness of the Company’s processes and controls to address and respond to those risks. Management is responsible for hiring appropriate personnel, integrating cybersecurity considerations into the Company’s overall risk management strategy, and for communicating key priorities to employees, as well as for approving budgets, helping prepare for cybersecurity incidents, approving cybersecurity processes, and reviewing security assessments and other security-related reports. Notwithstanding the focus and emphasis on cybersecurity, the Company has experienced and will continue to experience cybersecurity incidents, and there can be no guarantee that future incidents will not have a material adverse effect on its business. See Risk Factor “Breaches in security, whether cyber or physical, and related disruptions and/or our inability to prevent or respond to such breaches, has previously, and in the future could diminish our ability to generate revenues or contain costs, compromise our assets, and negatively impact our business in other ways" for more information on the Company's cybersecurity risks and a January 25, 2023 cybersecurity incident.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Company’s Board of Directors has ultimate oversight of the Company’s cybersecurity risk. Management updates the Board of Directors on the Company's cybersecurity and information security posture at least quarterly at the Company’s Board meetings, or more frequently as determined to be necessary or advisable. These updates include a review of cybersecurity incidents determined to have a moderate to high business impact, even if immaterial to the Company as a whole. The Audit Committee has responsibility for assisting the Board in the review and oversight of risks affecting the Company, and oversees the enterprise risk management process, which includes, with the assistance of senior management, assessing the Company’s exposure to cybersecurity risk and the effectiveness of the Company’s processes and controls to address and respond to those risks. Management is responsible for hiring appropriate personnel, integrating cybersecurity considerations into the Company’s overall risk management strategy, and for communicating key priorities to employees, as well as for approving budgets, helping prepare for cybersecurity incidents, approving cybersecurity processes, and reviewing security assessments and other security-related reports.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Company’s Board of Directors has ultimate oversight of the Company’s cybersecurity risk. Management updates the Board of Directors on the Company's cybersecurity and information security posture at least quarterly at the Company’s Board meetings, or more frequently as determined to be necessary or advisable. These updates include a review of cybersecurity incidents determined to have a moderate to high business impact, even if immaterial to the Company as a whole. The Audit Committee has responsibility for assisting the Board in the review and oversight of risks affecting the Company, and oversees the enterprise risk management process, which includes, with the assistance of senior management, assessing the Company’s exposure to cybersecurity risk and the effectiveness of the Company’s processes and controls to address and respond to those risks. Management is responsible for hiring appropriate personnel, integrating cybersecurity considerations into the Company’s overall risk management strategy, and for communicating key priorities to employees, as well as for approving budgets, helping prepare for cybersecurity incidents, approving cybersecurity processes, and reviewing security assessments and other security-related reports.
Cybersecurity Risk Role of Management [Text Block]	The Company’s Board of Directors has ultimate oversight of the Company’s cybersecurity risk. Management updates the Board of Directors on the Company's cybersecurity and information security posture at least quarterly at the Company’s Board meetings, or more frequently as determined to be necessary or advisable. These updates include a review of cybersecurity incidents determined to have a moderate to high business impact, even if immaterial to the Company as a whole. The Audit Committee has responsibility for assisting the Board in the review and oversight of risks affecting the Company, and oversees the enterprise risk management process, which includes, with the assistance of senior management, assessing the Company’s exposure to cybersecurity risk and the effectiveness of the Company’s processes and controls to address and respond to those risks. Management is responsible for hiring appropriate personnel, integrating cybersecurity considerations into the Company’s overall risk management strategy, and for communicating key priorities to employees, as well as for approving budgets, helping prepare for cybersecurity incidents, approving cybersecurity processes, and reviewing security assessments and other security-related reports.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Note 1 - Summary of Operations and Significant Accounting Policies 2 (Details Textual) - Extended Warranty Contracts [Member] $ in Thousands	Dec. 31, 2025 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 855
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Amount	$ 298
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Amount	$ 557
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Note 5 - Supplemental Balance Sheet Information - Components of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Raw materials	$ 42,150	$ 36,035
Work in process	4,045	4,501
Finished goods	7,813	10,827
Total	$ 54,008	$ 51,363

Note 5 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Minimum [Member]
Standard Product Warranty, Period	90 days
Maximum [Member]
Standard Product Warranty, Period	3 years
Capital Addition Purchase Commitments [Member]
Long-Term Purchase Commitment, Amount	$ 321

Note 8 - Operating Leases (Tables)

12 Months Ended

Dec. 31, 2025

Lease, Cost [Table Text Block]

	Year ended December 31,
	2025		2024
Operating lease cost	$	1,166	$	1,101
Variable lease cost		93		100
Total lease cost	$	1,259	$	1,201

Lessee, Lease, Cash Flow Information [Table Text Block]

	Year ended December 31,
	2025		2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,151	$	1,108
Right-of-use assets obtained in exchange for lease liabilities:	$	57	$	1,706

Lessee, Lease, Balance Sheet Information [Table Text Block]

		December 31,
	Balance Sheet Classification	2025			2024
Assets:
Operating lease right-of-use asset	Other noncurrent assets	$	3,344		$	4,153

Liabilities:
Current operating lease liability	Accrued expenses and other current liabilities	$	976		$	1,138
Operating lease liability, net of current portion	Other noncurrent liabilities		2,357			2,998
Total operating lease liability		$	3,333		$	4,136

Weighted-average remaining lease term (years)			4.1			4.5

Weighted-average discount rate			7.1	%		6.7	%

Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

Maturity of Operating Lease Liabilities
2026	$	1,013
2027		944
2028		933
2029		580
2030		156
Thereafter		196
Total lease payments	$	3,822
Less: Imputed interest		(489	)
Present value of remaining lease payments	$	3,333

Note 8 - Operating Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating lease right-of-use asset	$ 3,344	$ 4,153
Current operating lease liability	976	1,138
Operating lease liability, net of current portion	$ 2,357	$ 2,998
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Total operating lease liability	$ 3,333	$ 4,136
Weighted-average remaining lease term (years) (Year)	4 years 1 month 6 days	4 years 6 months
Weighted-average discount rate	7.10%	6.70%

Note 10 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenues	$ 191,159	$ 164,456
Cost of products sold	(145,138)	(122,142)
Gross profit	46,021	42,314
Operating Expenses	51,923	32,349
Segment contribution	(5,902)	9,965
Operating Income	(5,902)	9,965
Other expenses, net	(2,496)	(1,664)
Income tax provision	2,447	(1,892)
Non-controlling interest	53	(97)
Non-controlling interest	53	(97)
Net income attributable to Ultralife	(5,898)	6,312
Total assets	216,912	220,451
Capital expenditures	3,872	1,932
Goodwill	45,376	45,006
Depreciation and amortization of intangible assets	5,499	4,157
Stock-based compensation	935	698
Battery & Energy Products Segment [Member]
Goodwill	33,883	33,513
Communications Systems Segment [Member]
Goodwill	11,493	11,493
Operating Segments [Member]
Operating Expenses	(27,088)	(22,126)
Segment contribution	18,933	20,188
Operating Income	18,933	20,188
Operating Segments [Member] \| Battery & Energy Products Segment [Member]
Revenues	178,042	144,081
Cost of products sold	(135,402)	(107,764)
Gross profit	42,640	36,317
Operating Expenses	(22,417)	(17,320)
Segment contribution	20,223	18,997
Operating Income	20,223	18,997
Total assets	165,592	173,954
Capital expenditures	3,872	1,261
Goodwill	33,883	33,513
Depreciation and amortization of intangible assets	5,115	3,676
Stock-based compensation	602	383
Operating Segments [Member] \| Communications Systems Segment [Member]
Revenues	13,117	20,375
Cost of products sold	(9,736)	(14,378)
Gross profit	3,381	5,997
Operating Expenses	(4,671)	(4,806)
Segment contribution	(1,290)	1,191
Operating Income	(1,290)	1,191
Total assets	27,201	26,876
Capital expenditures	0	513
Goodwill	11,493	11,493
Depreciation and amortization of intangible assets	231	237
Stock-based compensation	97	96
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	0	0
Cost of products sold	0	0
Gross profit	0	0
Operating Expenses	(24,835)	(10,223)
Other expenses, net	(2,496)	(1,664)
Income tax provision	2,447	(1,892)
Non-controlling interest	53	(97)
Non-controlling interest	53	(97)
Total assets	24,119	19,621
Capital expenditures	0	158
Goodwill	0	0
Depreciation and amortization of intangible assets	153	244
Stock-based compensation	$ 236	$ 219

Note 3 - Debt (Tables)

12 Months Ended

Dec. 31, 2025

Schedule of Maturities of Long-Term Debt [Table Text Block]

2026	$	4,125
2027		5,500
2028		5,500
2029		35,125
Total	$	50,250

Note 4 - Supplemental Balance Sheet Information (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Depreciation	$ 3,981	$ 3,125
Number of Reporting Units	2
Goodwill, Impairment Loss	$ 0
Trade name	1,066
Trade name	1,066
Trade name	1,066
Trade name	1,046
Trade name	$ 1,029

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details

Note 9 - 401(k) Retirement Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Defined Contribution Plan, Employer Matching Contribution, First 3%, Percent of Match	100.00%	100.00%
Defined Contribution Plan, Maximum Employee Contribution Percentage, Subject to Employer Matching Contribution	3.00%	3.00%
Defined Contribution Plan, Employer Matching Contribution, Next 2%, Percent of Match	50.00%	50.00%
Defined Contribution Plan, Maximum Employee Contribution Percentage, Subject to Employer 50% Matching Contribution	2.00%	2.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%	4.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 1,203	$ 771

Note 6 - Stock-based Compensation - Stock Option Assumptions (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Risk-free interest rate	0.00%	4.30%
Volatility factor	0.00%	58.00%
Weighted average expected life (years) (Year)	0 years	4 years 8 months 12 days
Forfeiture rate	0.00%	10.00%
Dividends	0.00%	0.00%

Note 7 - Income Taxes

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Text Block]

Note 7 - Income Taxes

For the years ended December 31, 2025, and 2024, we recognized an income tax (benefit) provision of ($2,447) and $1,892, respectively.

	Year ended December 31,
	2025			2024
Current:
Federal	$	12		$	-
State		48			50
Foreign	34				610
	94				660
Deferred:
Federal	(1,802		)		1,313
State	(248		)		58
Foreign	(491		)		(139	)
	(2,541		)		1,232
Total income tax (benefit) provision	$	(2,447	)	$	1,892

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 assets and liabilities are as follows:

	December 31,
	2025			2024
Deferred tax assets:
Net operating loss carryforwards	$	4,809		$	5,817
Research and development	5,448				4,894
Tax credit carryforwards	3,448				3,180
Inventory reserves	2,991				2,859
Intangible assets	610				1,678
Lease Liability	728				905
Accrued expenses and other	1,318				1,542
Total deferred tax assets	19,352				20,875
Valuation allowance for deferred tax assets	(2,530		)		(2,404	)
Net deferred tax assets	16,822				18,471

Deferred tax liabilities:
Intangible assets	(5,619		)		(9,480	)
Property, plant and equipment	(980		)		(1,113	)
Right of use asset	(729		)		(908	)
Total deferred tax liabilities	(7,328		)		(11,501	)

Net deferred tax assets	$	9,494		$	6,970

Net deferred tax assets (liabilities) are comprised of the following balance sheet amounts:

	December 31,
	2025			2024

Deferred tax assets, net	$	10,494		$	8,413
Deferred tax liabilities	(1,000		)		(1,443	)
	$	9,494		$	6,970

For financial reporting purposes, net (loss) income from continuing operations before income taxes is as follows:

	Year ended December 31,
	2025			2024
United States	$	(5,863	)	$	7,044
Foreign	(2,535		)		1,257
	$	(8,398	)	$	8,301

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 from continuing operations before income taxes as follows under the guidance in ASU 2023-09 the Company adopted on a prospective basis:

	Year ended December 31, 2025

Federal statutory income tax rate	$	(1,763	)	21.0	%
State and local income taxes, net of federal income tax effect (a)		(204	)	2.4
Nontaxable or nondeductible items:
Equity compensation		136		(1.6	)
Nontaxable refund credit		(296	)	3.5
Other		14		(0.2	)
Other reconciling items		(127	)	1.5
Tax credits:
R&D		(267	)	3.2
Cross-border tax laws:		(20	)	0.2
Foreign tax effects:
China
R&D deduction		(103	)	1.2
Other		(8	)	0.1
Hong Kong
Tax rate differential		131		(1.5	)
Canada
Tax rate differential		164		(2.0	)
Provincial taxes		(303	)	3.6
Change in functional currency		170		(2.0	)
Other		20		(0.2	)
Other foreign jurisdictions		9		(0.1	)
Effective income tax rate	$	(2,447	)	29.1	%

State taxes and state tax adjustments in Florida and Virginia made up the majority (greater than 50%) of the tax effect in this category.

	Year ended December 31,
	2024

Statutory income tax rate		21.0	%
Increase (decrease) in tax provision resulting from:
Equity compensation		0.5
Global intangible low-taxed income		0.7
China R&D deduction		(1.1	)
Income tax credits		(3.6	)
Tax rate changes		(0.1	)
Foreign exchange loss		0.8
Foreign tax rates		2.3
States taxes		1.1
Transaction costs		0.7
Other		0.5
Effective income tax rate		22.8	%

Upon adoption of ASU 2023-09, as described in Note 1, cash paid for income taxes, net of refunds was as follows:

	Year ended December 31,
	2025

Federal	$	34
State		49
Foreign:
Canada		126
China		-
United Kingdom		(91	)
India		29
Total foreign		64
Total income taxes paid, net of refunds	$	147

As of December 31, 2025, it was concluded that it is more likely than not that our U.S. deferred tax assets will be fully realized based on management’s assessment. In evaluating the realizability of our U.S. deferred tax assets, management considered all available evidence, both positive and negative, weighted based on objective verifiability. Our assessment also considered our ability to fully utilize before expiration our domestic net operating loss carryforwards, which begin to expire in 2031, and our federal general business tax credit carryforwards, which begin to expire in 2028. As of December 31, 2025, our federal net operating loss carryforwards, state net operating loss carryforwards, and federal general business tax credit carryforwards were $8,800, $5,100 and $3,400, respectively.

As of December 31, 2025, for certain past operations in the U.K., we continue to report a valuation allowance for net operating loss carryforwards of approximately $10,100, nearly all of which can be carried forward indefinitely. Management has concluded that utilization of the U.K. net operating losses may be limited due to the change in the past U.K. operation, and that they cannot currently be used to reduce taxable income of our other U.K. subsidiary, Accutronics Ltd. There are no other deferred tax assets related to the past U.K. operations.

As of December 31, 2025, we have not recognized a valuation allowance against our other foreign deferred tax assets, including net operating loss carryforwards of $1,300 which expire in 2029 through 2035, as we believe that it is more likely than not that they will be fully realized.

There were no unrecognized tax benefits related to uncertain tax positions at December 31, 2025, and 2024.

As of December 31, 2025, the Company maintains its assertion that all foreign earnings will be indefinitely reinvested in those operations, other than earnings generated in the U.K.

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 2022 through 2024 remain subject to IRS examination. Our U.S. tax matters for 2005-2007, 2009, and 2011-2015 also remain subject to IRS examination due to the remaining availability of net operating loss carryforwards generated in those years. Our U.S. tax matters for 2015 through 2024 remain subject to examination by various state and local tax jurisdictions. Our tax matters for the years 2015 through 2024 remain subject to examination by the respective foreign tax jurisdiction authorities.

The entire disclosure for income tax.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section S99
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

Note 4 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cost	$ 25,595	$ 38,685
Accumulated Amortization	14,662	14,128
Net	10,933	24,557
Customer Relationships [Member]
Cost	18,333	18,154
Accumulated Amortization	8,360	7,296
Net	9,973	10,858
Patented Technology [Member]
Cost	5,762	5,690
Accumulated Amortization	5,635	5,428
Net	127	262
Other Intangible Assets [Member]
Cost	1,500	1,500
Accumulated Amortization	667	591
Net	833	909
Trade Names [Member]
Cost	0	9,942
Accumulated Amortization	0	813
Net	0	9,129
Trademarks [Member]
Cost	0	3,399
Accumulated Amortization	0	0
Net	$ 0	$ 3,399

Note 8 - Operating Leases (Details Textual)	Dec. 31, 2025
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	7 years

Note 7 - Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Domestic	$ 12	$ 0
State	48	50
Foreign	34	610
Current Income Tax Expense (Benefit)	94	660
Domestic	(1,802)	1,313
State	(248)	58
Foreign	(491)	(139)
Deferred Income Tax Expense (Benefit)	(2,541)	1,232
Total income tax (benefit) provision	$ (2,447)	$ 1,892

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Note 7 - Income Taxes - Effective Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Federal statutory income tax rate, percent		21.00%
Equity compensation, percent		0.50%
Global intangible low-taxed income, percent		0.70%
State and local income taxes, net of federal income tax effect, percent		1.10%
R&D, percent		(3.60%)
Tax rate changes, percent		(0.10%)
Foreign exchange loss, percent		0.80%
Tax rate differential, percent		2.30%
Transaction costs, percent		0.70%
Other reconciling items (Rate)		0.50%
Effective income tax rate	29.10%	22.80%
Total income tax (benefit) provision	$ (2,447)	$ 1,892
State Administration of Taxation, China [Member]
R&D deduction, percent	1.20%	(1.10%)
Other reconciling items (Rate)	0.10%
Other reconciling items	$ (8)
R&D deduction	$ (103)
Inland Revenue, Hong Kong [Member]
Tax rate differential, percent	(1.50%)
Tax rate differential	$ 131
Canada Revenue Agency [Member]
State and local income taxes, net of federal income tax effect	$ (303)
State and local income taxes, net of federal income tax effect, percent	3.60%
Tax rate differential, percent	(2.00%)
Other reconciling items (Rate)	(0.20%)
Other reconciling items	$ 20
Tax rate differential	164
Change in functional currency	$ 170
Change in functional currency, percent	(2.00%)
Other Foreign Income Tax Authority [Member]
Tax rate differential, percent	(0.10%)
Tax rate differential	$ 9
Domestic Tax Jurisdiction [Member]
Federal statutory income tax rate	$ (1,763)
Federal statutory income tax rate, percent	21.00%
Equity compensation, percent	(1.60%)
State and local income taxes, net of federal income tax effect	$ (204)
State and local income taxes, net of federal income tax effect, percent	2.40%
R&D, percent	3.20%
Equity compensation	$ 136
Nontaxable refund credit	$ (296)
Nontaxable refund credit, percent	3.50%
Other nontaxable or nondeductible items	$ 14
Other nontaxable or nondeductible items, percent	(0.20%)
Other reconciling items (Rate)	1.50%
Other reconciling items	$ (127)
R&D	(267)
Cross-border tax laws:	$ (20)
Cross-border tax laws: (Rate)	0.20%

Note 6 - Share-based Compensation - Options Range of Exercise Prices (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Lower range limit (in dollars per share)	$ 4.07
Upper range limit (in dollars per share)	$ 8.5
Options outstanding, number of outstanding options (in shares)	967,351
Options outstanding, weighted-average remaining contractual life (Year)	3 years 9 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 6.95
Options exercisable, number of options exercisable (in shares)	737,972
Options exercisable – weighted average exercise price (in dollars per share)	$ 6.78	$ 7.18
Range One [Member]
Lower range limit (in dollars per share)	4.07
Upper range limit (in dollars per share)	$ 6.51
Options outstanding, number of outstanding options (in shares)	301,804
Options outstanding, weighted-average remaining contractual life (Year)	2 years 11 months 8 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.69
Options exercisable, number of options exercisable (in shares)	297,638
Options exercisable – weighted average exercise price (in dollars per share)	$ 5.72
Range Two [Member]
Lower range limit (in dollars per share)	6.84
Upper range limit (in dollars per share)	$ 6.97
Options outstanding, number of outstanding options (in shares)	291,853
Options outstanding, weighted-average remaining contractual life (Year)	4 years 1 month 28 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 6.88
Options exercisable, number of options exercisable (in shares)	228,453
Options exercisable – weighted average exercise price (in dollars per share)	$ 6.89
Range Three [Member]
Lower range limit (in dollars per share)	7.86
Upper range limit (in dollars per share)	$ 7.86
Options outstanding, number of outstanding options (in shares)	242,780
Options outstanding, weighted-average remaining contractual life (Year)	5 years 11 months 12 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 7.86
Options exercisable, number of options exercisable (in shares)	80,967
Options exercisable – weighted average exercise price (in dollars per share)	$ 7.86
Range Four [Member]
Lower range limit (in dollars per share)	8.25
Upper range limit (in dollars per share)	$ 8.5
Options outstanding, number of outstanding options (in shares)	130,914
Options outstanding, weighted-average remaining contractual life (Year)	1 year 3 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 8.34
Options exercisable, number of options exercisable (in shares)	130,914
Options exercisable – weighted average exercise price (in dollars per share)	$ 8.34

Note 6 - Stock-based Compensation

12 Months Ended

Dec. 31, 2025

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

Note 6 – Stock-Based Compensation

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

	Year ended December 31,
	2025		2024
Stock options	$	770	$	640
Restricted stock		165		58
Total	$	935	$	698

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

On July 16, 2024, our stockholders approved the 2024 Long-Term Incentive Plan (“2024 LTIP”) as the successor plan to the 2014 Long-Term Incentive Plan (“2014 LTIP”) that expired on June 2, 2024. Under the 2024 LTIP, a total of 2,000,000 shares of common stock were made available for grant of awards. Of the total number of shares of common stock available for awards under the 2024 LTIP, no more than 800,000 shares of common stock may be used for awards other than stock options and stock appreciation rights. Grants under the 2024 LTIP may be awarded through July 15, 2034.

Stock options granted under the 2024 LTIP and 2014 LTIP 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. Stock options vest in equal installments on the first, second and third anniversaries of the grant date and expire on the seventh anniversary of the grant date. As of December 31, 2025, there were 242,780 stock options outstanding under the 2024 LTIP and 724,571 stock options outstanding under the 2014 LTIP.

As of December 31, 2025, there was $384 of total unrecognized compensation costs related to outstanding stock options, which we expect to recognize over a weighted average period of 1.3 years.

We use the Black-Scholes option-pricing model to estimate fair value of stock options. There were no stock options awarded for the year ended December 31, 2025. The following weighted average assumptions were used to value options granted during the year ended December 31, 2024:

	Year ended December 31,
	2025		2024
Risk-free interest rate		-		4.3	%
Volatility factor		-		58	%
Weighted average expected life (years)		-		4.7
Forfeiture rate		-		10.0	%
Dividends		-		0.0	%

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 and consideration of 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 based on historical experience.

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

Year ended December 31, 2025
	Number of shares			Weighted average exercise price per share		Weighted average remaining contractual term		Aggregate intrinsic value
Shares under option – January 1		1,106,436		$	7.15
Options granted		-			-
Options exercised		(15,982	)		6.10
Options forfeited or expired		(123,103	)		8.87
Shares under option – December 31		967,351		$	6.95		3.80	$	83
Vested and expected to vest - December 31		911,744		$	6.92		3.69	$	81

Options exercisable – December 31		737,972		$	6.78		3.23	$	76

Year ended December 31, 2024
	Number of shares			Weighted average exercise price per share		Weighted average remaining contractual term		Aggregate intrinsic value
Shares under option – January 1		1,250,595		$	7.10
Options granted		261,520			7.85
Options exercised		(298,293	)		7.08
Options forfeited or expired		(107,386	)		8.41
Shares under option – December 31		1,106,436		$	7.15		4.53	$	741
Vested and expected to vest - December 31		1,003,942		$	7.17		4.36	$	674

Options exercisable – December 31		625,826		$	7.18		3.18	$	477

The following table represents additional information about stock options outstanding at December 31, 2025:

			Option outstanding						Options exercisable
Range of exercise prices			Number of outstanding options		Weighted-average remaining contractual life		Weighted- average exercise price		Number of options exercisable		Weighted- average exercise price
$4.07	-	$6.51		301,804		2.94	$	5.69		297,638	$	5.72
$6.84	-	$6.97		291,853		4.16		6.88		228,453		6.89
$7.86	-	$7.86		242,780		5.95		7.86		80,967		7.86
$8.25	-	$8.50		130,914		1.01		8.34		130,914		8.34

$4.07	-	$8.50		967,351		3.80	$	6.95		737,972	$	6.78

The weighted average fair value of options granted during the year ended December 31, 2024, was $4.08. There were no stock options awarded during the year ended December 31, 2025. 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, 2025, and 2024 was $24 and $1,007, respectively.

Cash received from stock option exercises under our stock-based compensation plans for the years ended December 31, 2025, and 2024 was $98 and $1,999, respectively.

Restricted stock awards vest in equal annual installments over three years. The Company granted restricted stock awards of 18,200 shares and 35,700 shares for the years ended December 31, 2025, and 2024, respectively. The average grant date fair value of restricted stock awards was $5.40 and $8.71 for the years ended December 31, 2025, and 2024, respectively. As of December 31, 2025, there was $180 of total unrecognized compensation costs related to outstanding restricted shares.

There were 1,709,020 shares of common stock available for future issuance under equity compensation plans as of December 31, 2025.

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2025	Mar. 20, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	0-20852
Entity Registrant Name	ULTRALIFE CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	2000 Technology Parkway
Entity Address, City or Town	Newark
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14513
Entity Tax Identification Number	16-1387013
City Area Code	315
Local Phone Number	332-7100
Title of 12(b) Security	Common Stock, $0.10 par value per share
Trading Symbol	ULBI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 90,469,809
Entity Common Stock, Shares Outstanding (in shares)		16,656,503
Auditor Name	WithumSmith+Brown, PC
Auditor Location	Rochester, New York
Auditor Firm ID	100
Entity Central Index Key	0000875657
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false

Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Stock compensation plan expense	$ 935	$ 698
Share-Based Payment Arrangement, Option [Member]
Stock compensation plan expense	770	640
Restricted Stock [Member]
Stock compensation plan expense	$ 165	$ 58

Note 9 - 401(k) Retirement Benefit Plan

12 Months Ended

Dec. 31, 2025

Retirement Benefits [Text Block]

Note 9 - 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. For the years ended December 31, 2025, and 2024, the Company matched 100% on the first 3% and 50% on the next 2% contributed by the employee, or a maximum of 4% of the employee’s income. For 2025 and 2024, we contributed $1,203 and $771, respectively, to the 401(k) plan.

The entire disclosure for retirement benefits.

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Note 6 - Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Shares under option, beginning of period (in shares)	1,106,436	1,250,595
Options outstanding - weighted average exercise price (in dollars per share)	$ 7.15	$ 7.1
Options granted (in shares)	0	261,520
Options granted (in dollars per share)	$ 0	$ 7.85
Options exercised (in shares)	(15,982)	(298,293)
Options exercised (in dollars per share)	$ 6.1	$ 7.08
Options forfeited or expired (in shares)	(123,103)	(107,386)
Options forfeited or expired (in dollars per share)	$ 8.87	$ 8.41
Shares under option, end of period (in shares)	967,351	1,106,436
Options outstanding - weighted average exercise price (in dollars per share)	$ 6.95	$ 7.15
Options outstanding - weighted average remaining contractual term (Year)	3 years 9 months 18 days	4 years 6 months 10 days
Options outstanding - aggregate intrinsic value	$ 83	$ 741
Shares under option, end of period	$ 83	$ 741
Vested and Expected to Vest (in shares)	911,744	1,003,942
Options vested and expected to vest - weighted average exercise price (in dollars per share)	$ 6.92	$ 7.17
Options vested and expected to vest - weighted average remaining contractual term (Year)	3 years 8 months 8 days	4 years 4 months 9 days
Options vested and expected to vest - aggregate intrinsic value	$ 81	$ 674
Options exercisable – aggregate intrinsic value (in shares)	737,972	625,826
Options exercisable – weighted average exercise price (in dollars per share)	$ 6.78	$ 7.18
Options exercisable – weighted average remaining contractual term (Year)	3 years 2 months 23 days	3 years 2 months 4 days
Options exercisable - aggregate intrinsic value	$ 76	$ 477

Note 2 - Acquisition (Tables)

12 Months Ended

Dec. 31, 2025

Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]

Accounts receivable	$	5,270
Inventories		9,172
Prepaid expenses and other current assets		251
Property, plant and equipment		20,735
Goodwill		7,558
Other intangible assets		10,500
Other noncurrent assets		237
Accounts payable		(2,231	)
Accrued compensation and related benefits		(1,561	)
Accrued expenses and other current liabilities		(904	)
Deferred tax liability, net		(748	)
Other noncurrent liabilities		(257	)
Net assets acquired	$	48,022

Business Combination, Intangible Asset, Acquired, Finite-Lived [Table Text Block]

					Annual Amortization
	Estimated Fair Value		Amortization Period (Years)		Year 1		Year 2		Year 3		Year 4		Year 5
Trade name	$	5,300		15	$	353	$	353	$	353	$	353	$	353
Customer relationships		5,100		15		340		340		340		340		340
Patents and technology		100		5		20		20		20		20		20
Total	$	10,500			$	713	$	713	$	713	$	713	$	713

Note 5 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, plant and equipment, gross	$ 112,916	$ 108,922
Less: Accumulated depreciation	(72,519)	(68,437)
Property, plant and equipment, net	40,397	40,485
Land [Member]
Property, plant and equipment, gross	4,693	4,693
Building and Building Improvements [Member]
Property, plant and equipment, gross	30,179	30,109
Machinery and Equipment [Member]
Property, plant and equipment, gross	63,556	60,986
Furniture and Fixtures [Member]
Property, plant and equipment, gross	3,195	3,067
Computer Equipment [Member]
Property, plant and equipment, gross	8,164	7,990
Construction in Progress [Member]
Property, plant and equipment, gross	$ 3,129	$ 2,077

Note 4 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Amortization of intangible assets	$ 1,518	$ 1,032
Research and Development Expense [Member]
Amortization of intangible assets	1,395	929
Selling, General and Administrative Expenses [Member]
Amortization of intangible assets	$ 123	$ 103

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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Note 10 - Business Segment Information

12 Months Ended

Dec. 31, 2025

Segment Reporting Disclosure [Text Block]

Note 10 - Business Segment Information

Operating segments represent a component of the Company that engages in business activities from which it may recognize revenues and incur expenses whose operating results are regularly reviewed by the public entity’s chief operating decision maker (“CODM”) to make decisions about resources to be allocated to the segment and assess its performance, and for which discrete financial information is available. Once operating segments are identified, the Company determined which of those operating segments are required to be presented as reportable segments based on the quantitative thresholds.

We structure our operations primarily around the products we sell and report our financial results in following two operating segments: Battery & Energy Products and Communications Systems. The Battery & Energy Products segment includes Lithium 9-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.

Our Chief Operating Decision Maker (“CODM”) is Mike Manna, President & Chief Executive Officer. Both of our business segments are regularly reviewed by the CODM through weekly revenue, gross margin and consolidated financial forecast updates, bi-weekly business and financial reviews to assess business performance, top priorities, utilization of resources and to regularly communicate with segment management, who are part of the CODM’s executive leadership team, and monthly meetings with the executive leadership team. In his role as CODM, Mr. Manna is deeply involved in business operations through daily updates by the segment management and ongoing financial, revenue and operations discussions.

The primary financial measures used by the CODM to monitor and evaluate the performance of the operating segments is segment contribution, as defined by gross profit less direct research and development (“R&D”) and direct selling, general and administrative (“SG&A”) expenses. This metric is used as a consistent benchmark for comparison across reporting periods.

The significant segment expenses regularly reviewed by the CODM and included in segment contribution are cost of products sold and direct R&D and SG&A expenses. There are no other segment items included in segment contribution beyond the significant expenses disclosed.

Corporate general and administrative (“G&A”) expenses, including costs associated with our acquisitions, include corporate functions including board of directors, executive officers, accounting & finance, human resources, legal, information technology and their related functional expenses. These costs are not directly allocable to the business segments.

2025:

	Battery & Energy Products			Communications Systems			Corporate			Total
Revenue	$	178,042		$	13,117		$	-		$	191,159
Cost of products sold		(135,402	)		(9,736	)		-			(145,138	)
Gross profit		42,640			3,381			-			46,021
Direct R&D and SG&A expenses		(22,417	)		(4,671	)		-			(27,088	)
Segment contribution		20,223			(1,290	)		-			18,933
Corporate G&A expenses		-			-			(24,835	)		(24,835	)
Operating loss											(5,902	)
Other expense, net								(2,496	)		(2,496	)
Income tax provision								2,447			2,447
Non-controlling interest								53			53
Net loss attributable to Ultralife										$	(5,898	)

Total assets	$	165,592		$	27,201		$	24,119		$	216,912
Capital expenditures	$	3,872		$	-		$	-		$	3,872
Goodwill	$	33,883		$	11,493		$	-		$	45,376
Depreciation and amortization of intangible assets	$	5,115		$	231		$	153		$	5,499
Stock-based compensation	$	602		$	97		$	236		$	935

2024:

	Battery & Energy Products			Communications Systems			Corporate			Total
Revenue	$	144,081		$	20,375		$	-		$	164,456
Cost of products sold		(107,764	)		(14,378	)		-			(122,142	)
Gross profit		36,317			5,997			-			42,314
Direct R&D and SG&A expenses		(17,320	)		(4,806	)		-			(22,126	)
Segment contribution		18,997			1,191			-			20,188
Corporate G&A expenses		-			-			(10,223	)		(10,223	)
Operating profit											9,965
Other expense, net								(1,664	)		(1,664	)
Income tax provision								(1,892	)		(1,892	)
Non-controlling interest								(97	)		(97	)
Net income attributable to Ultralife										$	6,312

Total assets	$	173,954		$	26,876		$	19,621		$	220,451
Capital expenditures	$	1,261		$	513		$	158		$	1,932
Goodwill	$	33,513		$	11,493		$	-		$	45,006
Depreciation and amortization of intangible assets	$	3,676		$	237		$	244		$	4,157
Stock-based compensation	$	383		$	96		$	219		$	698

Long-lived assets (comprised of property, plant and equipment; goodwill; and other intangible assets) held outside the U.S., principally in Canada, United Kingdom and China, were $19,777 and $22,306, net of accumulated depreciation and amortization, as of December 31, 2025, and 2024, respectively.

The following tables disaggregate our business segment revenues by major source and geography.

Commercial and Government/Defense Revenue Information:

Year ended December 31, 2025:

	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	178,042	$	125,295		$	52,747
Communications Systems		13,117		-			13,117
Total	$	191,159	$	125,295		$	65,864
				66	%		34	%

Year ended December 31, 2024:

	Total Revenue		Commercial			Government/ Defense
Battery & Energy Products	$	144,081	$	102,082		$	41,999
Communications Systems		20,375		-			20,375
Total	$	164,456	$	102,082		$	62,374
				62	%		38	%

U.S. and Non-U.S. Revenue Information¹:

Year ended December 31, 2025:

	Total Revenue		United States			Non-United States
Battery & Energy Products	$	178,042	$	125,903		$	52,139
Communications Systems		13,117		11,174			1,943
Total	$	191,159	$	137,077		$	54,082
				72	%		28	%

Year ended December 31, 2024:

	Total Revenue		United States			Non-United States
Battery & Energy Products	$	144,081	$	82,227		$	61,854
Communications Systems		20,375		14,813			5,562
Total	$	164,456	$	97,040		$	67,416
				59	%		41	%

¹Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Note 1 - Summary of Operations and Significant Accounting Policies 1 (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($) shares
Capitalized Contract Cost, Gross \| $	$ 0	$ 0
Research and Development Expense, Gross \| $	12,079	9,549
Customer Funded Research and Development Expense Included in Cost of Goods Sold \| $	$ 1,681	$ 1,281
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements	0	212,197
Number of Operating Segments	2
Share-Based Payment Arrangement [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements	0
Share-Based Payment Arrangement, Option [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements		770,376
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	967,351	336,060
Restricted Stock [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements		38,386
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	40,343
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Major Customers	1	1
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Large Defense Primary Contractor, 1 [Member]
Concentration Risk, Percentage	27.00%	23.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Large Defense Primary Contractor, 1 [Member] \| Battery & Energy Products Segment [Member]
Concentration Risk, Percentage	29.00%	24.00%
Minimum [Member]
Standard Product Warranty, Period	90 days
Maximum [Member]
Standard Product Warranty, Period	3 years
Extended Warranty Contracts [Member]
Extended Product Warranty, Period	8 years
Revenue, Remaining Performance Obligation, Amount \| $	$ 855
Certain Communications Systems Products [Member]
Contract with Customer, Liability, Revenue Recognized \| $	$ 298	$ 298

Note 2 - Acquisition

12 Months Ended

Dec. 31, 2025

Business Combination [Text Block]

Note 2 – Acquisition

On October 31, 2024, the Company completed the acquisition of all issued and outstanding shares of Electrochem Solutions, Inc., a Massachusetts corporation (“Electrochem”), pursuant to a stock purchase agreement (the “Agreement”) with Greatbatch Ltd., a New York corporation (the “Seller”), dated September 27, 2024 (the “Acquisition”). The Agreement established a purchase price of $50,000 for the Acquisition subject to customary working capital adjustments. The Company completed the Acquisition for $48,022 in cash, inclusive of working capital adjustments of $1,978.

Based in Raynham, Massachusetts and with over forty years of battery technology experience in critical applications, Electrochem designs and manufactures primary lithium metal and ultracapacitor cells and battery packs serving energy, military and various environmental, industrial and utility end markets on a global basis. Acquiring Electrochem advances our strategy of more fully realizing the operating leverage of our business model through scale and manufacturing cost efficiencies. Electrochem brought a blue-chip customer base with little or no overlap with Ultralife’s then existing customers, long-tenured technical resources which we plan to utilize in progressing our global new product initiatives, and a complimentary portfolio of highly engineered Thionyl, Sulfuryl and Bromine Chloride cells and packs which can be commercially cost prohibitive to substitute or switch out. We view this acquisition as an avenue to create highly attractive opportunities to drive revenue growth through heightened cross-selling platforms and extend our reach into underserved adjacent markets that demand uncompromised safety, service, reliability and quality. In addition, the combination of Electrochem and Ultralife creates achievable opportunities for gross margin expansion through the realization of vertical integration, supply chain synergies and lean initiatives. With Electrochem we are increasing our value to our customers and significantly strengthening our competitive position in our end markets.

The Company funded the purchase price for the Acquisition through the New Credit Agreement (refer to Note 3).

The Acquisition was accounted for in accordance with the accounting treatment of a business combination pursuant to FASB ASC Topic 805, “Business Combinations” (“ASC 805”). Accordingly, the purchase price was allocated to the tangible and intangible assets acquired and the liabilities assumed based on their estimated fair values on the acquisition date. The excess of the purchase price over the estimated fair value of the separately identifiable assets acquired and liabilities assumed was allocated to goodwill. Management is responsible for determining the acquisition date fair value of the assets acquired and liabilities assumed, which requires the use of various assumptions and judgments that are inherently subjective. The purchase price allocation presented below reflects all known information about the fair value of the assets acquired and liabilities assumed as of the acquisition date.

Accounts receivable	$	5,270
Inventories		9,172
Prepaid expenses and other current assets		251
Property, plant and equipment		20,735
Goodwill		7,558
Other intangible assets		10,500
Other noncurrent assets		237
Accounts payable		(2,231	)
Accrued compensation and related benefits		(1,561	)
Accrued expenses and other current liabilities		(904	)
Deferred tax liability, net		(748	)
Other noncurrent liabilities		(257	)
Net assets acquired	$	48,022

The goodwill included in the Company’s purchase price allocation presented above represents the value of Electrochem’s assembled and trained workforce, the incremental value that Electrochem engineering and technology will bring to the Company and the revenue growth which is expected to occur over time which is 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.

Other intangible assets were valued using the income approach which requires a forecast of all expected future cash flows and the use of certain assumptions and estimates. The following table summarizes the estimated fair value and annual amortization for each of the identifiable intangible assets acquired.

					Annual Amortization
	Estimated Fair Value		Amortization Period (Years)		Year 1		Year 2		Year 3		Year 4		Year 5
Trade name	$	5,300		15	$	353	$	353	$	353	$	353	$	353
Customer relationships		5,100		15		340		340		340		340		340
Patents and technology		100		5		20		20		20		20		20
Total	$	10,500			$	713	$	713	$	713	$	713	$	713

We acquired right-of-use assets and assumed operating lease liabilities of $230. Right-of-use assets are classified as other noncurrent assets, and current and long-term lease liabilities are classified as accrued expenses and other current liabilities and other noncurrent liabilities, respectively, on the Company’s consolidated balance sheets.

The operating results and cash flows of Electrochem are reflected in the Company’s consolidated financial statements from the date of acquisition. Electrochem is included in the Battery & Energy Products segment.

For the year ended December 31, 2025, Electrochem contributed revenue of $32,599 and pre-tax income of $997, inclusive of a $120 increase in cost of products sold for the fair value step-up of acquired finished goods inventory sold during the period, and amortization expense of $625 on acquired identifiable intangible assets.

During the year ended December 31, 2025, the Company incurred transaction costs and other non-recurring expenses of $973 directly attributable to the acquisition, including one-time accounting, legal and due diligence services. These costs are included in selling, general and administrative expense on the consolidated statement of (loss) income and comprehensive (loss) income for the year ended December 31, 2025.

For the year ended December 31, 2024, Electrochem contributed revenue of $6,062 and pre-tax income of $932, inclusive of a $120 increase in cost of products sold for the fair value step-up of acquired finished goods inventory sold during the period, and amortization expense of $119 on acquired identifiable intangible assets.

During the year ended December 31, 2024, the Company incurred transaction costs and other non-recurring expenses of $1,294 directly attributable to the acquisition, including one-time accounting, legal and due diligence services. These costs are included in selling, general and administrative expense on the consolidated statement of (loss) income and comprehensive (loss) income for the year ended December 31, 2024.

The entire disclosure for business combination.

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Note 10 - Business Segment Information (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Number of Reportable Segments	2
Non-US [Member]
Long-Lived Assets	$ 19,777	$ 22,306

Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Income Tax Expense (Benefit)	$ (2,447)	$ 1,892
Operating Loss Carryforwards	1,300
Deferred Tax Assets, Valuation Allowance	2,530	2,404
Unrecognized Tax Benefits, Ending Balance	0	$ 0
General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	3,400
Domestic Tax Jurisdiction [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 8,800
Open Tax Year	2022 2023 2024
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 5,100
Open Tax Year	2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Foreign Tax Jurisdiction [Member]
Deferred Tax Assets, Valuation Allowance	$ 0
Open Tax Year	2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Foreign Tax Jurisdiction [Member] \| His Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards	$ 10,100

Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenues	$ 191,159	$ 164,456
UNITED STATES
Revenues	$ 137,077	$ 97,040
Revenue, percentage	72.00%	59.00%
Non-US [Member]
Revenues	$ 54,082	$ 67,416
Revenue, percentage	28.00%	41.00%
Commercial [Member]
Revenues	$ 125,295	$ 102,082
Revenue, percentage	66.00%	62.00%
Government & Defense [Member]
Revenues	$ 65,864	$ 62,374
Revenue, percentage	34.00%	38.00%
Battery & Energy Products Segment [Member]
Revenues	$ 178,042	$ 144,081
Battery & Energy Products Segment [Member] \| UNITED STATES
Revenues	125,903	82,227
Battery & Energy Products Segment [Member] \| Non-US [Member]
Revenues	52,139	61,854
Battery & Energy Products Segment [Member] \| Commercial [Member]
Revenues	125,295	102,082
Battery & Energy Products Segment [Member] \| Government & Defense [Member]
Revenues	52,747	41,999
Communications Systems Segment [Member]
Revenues	13,117	20,375
Communications Systems Segment [Member] \| UNITED STATES
Revenues	11,174	14,813
Communications Systems Segment [Member] \| Non-US [Member]
Revenues	1,943	5,562
Communications Systems Segment [Member] \| Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] \| Government & Defense [Member]
Revenues	$ 13,117	$ 20,375

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Net operating loss carryforwards	$ 4,809	$ 5,817
Research and development	5,448	4,894
Tax credit carryforwards	3,448	3,180
Inventory reserves	2,991	2,859
Intangible assets	610	1,678
Lease Liability	728	905
Accrued expenses and other	1,318	1,542
Total deferred tax assets	19,352	20,875
Valuation allowance for deferred tax assets	(2,530)	(2,404)
Net deferred tax assets	16,822	18,471
Intangible assets	(5,619)	(9,480)
Property, plant and equipment	(980)	(1,113)
Right of use asset	(729)	(908)
Total deferred tax liabilities	(7,328)	(11,501)
Net deferred tax assets	$ 9,494	$ 6,970

Note 7 - Income Taxes - Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred income taxes, net	$ 10,494	$ 8,413
Deferred tax liabilities	(1,000)	(1,443)
Deferred Tax Assets, Net	$ 9,494	$ 6,970

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Current assets:
Cash	$ 9,345	$ 6,854
Trade accounts receivable, net of allowance for expected credit losses of $457 and $384, respectively	33,948	29,370
Inventories, net	54,008	51,363
Prepaid expenses and other current assets	8,500	9,573
Total current assets	105,801	97,160
Property, plant and equipment, net	40,397	40,485
Goodwill	45,376	45,006
Other intangible assets, net	10,933	24,557
Deferred income taxes, net	10,494	8,413
Other noncurrent assets	3,911	4,830
Total assets	216,912	220,451
Current liabilities:
Accounts payable	17,423	14,160
Current portion of long-term debt	4,125	2,750
Accrued compensation and related benefits	2,754	2,911
Accrued expenses and other current liabilities	13,031	9,470
Total current liabilities	37,333	29,291
Long-term debt, net	45,526	51,502
Deferred income taxes	1,000	1,443
Other noncurrent liabilities	2,919	4,028
Total liabilities	86,778	86,264
Commitments and Contingencies
Stockholders’ equity:
Preferred stock – par value $.10 per share; authorized 1,000,000 shares; none issued	0	0
Common stock – par value $.10 per share; authorized 40,000,000 shares; issued – 21,092,617 shares and 21,069,079 shares, respectively; outstanding – 16,656,503 shares and 16,632,965 shares, respectively	2,109	2,107
Capital in excess of par value	192,859	191,828
Accumulated deficit	(40,340)	(34,442)
Accumulated other comprehensive loss	(3,141)	(4,006)
Treasury stock - at cost; 4,436,114 shares and 4,436,114 shares, respectively	(21,492)	(21,492)
Total Ultralife Corporation equity	129,995	133,995
Non-controlling interest	139	192
Total stockholders’ equity	130,134	134,187
Total liabilities and stockholders’ equity	$ 216,912	$ 220,451

Note 7 - Income Taxes - Summary of Income Taxes Paid (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
US Federal	$ 34
State and local	49
Foreign	64
Total income taxes paid, net of refunds	147
Canada Revenue Agency [Member]
Foreign	126
State Administration of Taxation, China [Member]
Foreign	0
His Majesty's Revenue and Customs (HMRC) [Member]
Foreign	(91)
Ministry of Finance, India [Member]
Foreign	$ 29

Consolidated Statements of Income and Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenues	$ 191,159	$ 164,456
Cost of products sold	145,138	122,142
Gross profit	46,021	42,314
Operating expenses:
Research and development	10,398	8,268
Selling, general and administrative	29,344	24,081
Intangible asset impairment	(12,181)	0
Total operating expenses	51,923	32,349
Operating (loss) income	(5,902)	9,965
Other expense (income):
Interest and financing expense	3,953	1,940
Miscellaneous income	(1,457)	(276)
Total other expense, net	2,496	1,664
(Loss) income before income taxes	(8,398)	8,301
Income tax (benefit) provision	(2,447)	1,892
Net (loss) income	(5,951)	6,409
Net (loss) income attributable to non-controlling interest	(53)	97
(Loss) income attributable to Ultralife Corporation	(5,898)	6,312
Other comprehensive income (loss):
Foreign currency translation adjustments	865	(346)
Comprehensive (loss) income attributable to Ultralife Corporation	$ (5,033)	$ 5,966
Net (loss) income per share attributable to Ultralife Corporation common stockholders – Basic (in dollars per share)	$ (35)	$ 38
Net (loss) income per share attributable to Ultralife Corporation common stockholders – Diluted (in dollars per share)	$ (35)	$ 38
Weighted average shares outstanding – Basic (in shares)	16,642	16,555
Weighted average shares outstanding – Diluted (in shares)	16,642	16,767

Note 5 - Commitments and Contingencies

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Text Block]

Note 5 - Commitments and Contingencies

a.	Legal Matters

We are subject to legal proceedings and claims that arise from time to time in the ordinary course of business. We believe that the final disposition of any such matters of which we are currently aware will not have a material adverse effect on the Company’s financial position, results of operations or cash flows. However, recognizing that legal matters are subject to inherent uncertainties, there exists the possibility that ultimate resolution of current or future legal matters could have a material adverse impact on the Company’s financial position, results of operations or cash flows. We are not aware of any such situations at this time.

b.	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.

c.	Purchase Commitments

As of December 31, 2025, we have made commitments to purchase approximately $321 of production machinery and equipment.

China

Our operating facility in China presents risks including, but not limited to, changes in local regulatory requirements, 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, currency restrictions, currency exchange controls, fluctuations of currency, and currency revaluations, eminent domain claims, civil unrest, power outages, water shortages, labor shortages, labor disputes, increase in labor costs, rapid changes in government, economic and political policies, political or civil unrest, acts of terrorism, or the threat of boycotts, other civil disturbances and the possible impact of the imposition of tariffs by the U.S. Government on 9-volt batteries that we manufacture in China as well as any retaliating trade policies or restrictions. Any such disruptions could depress our earnings and have other material adverse effects on our business, financial condition and results of operations.

e.	Product Warranties

We typically offer standard warranties against product defects that range from ninety (90) days to three (3) years from the date of purchase. We also offer separately priced extended warranty contracts on certain products. Warranty costs expected to be incurred are estimated based on the Company’s experience and recorded as costs of products sold. Standard warranty costs are recognized upon product sale. Extended warranty costs are recognized over the term of the contract. The following table summarizes the warranty activity for the years ended December 31, 2025, and 2024:

	2025			2024
Accrued warranty obligations – beginning	$	887		$	547
Accruals for warranties issued		656			1,149
Settlements made		(417	)		(809	)
Accrued warranty obligations - ending	$	1,126		$	887

Note 3 - Debt

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Text Block]

Note 3 – Debt

On October 31, 2024, Ultralife, SWE, CLB, Excell USA, and Electrochem, as borrowers, and certain other subsidiaries of the Company, entered into a new Credit and Security Agreement with KeyBank National Association (“KeyBank” or the “Bank”), as lender and administrative agent (the “New Credit Agreement”). The proceeds of the loans under the New Credit Agreement were used, in part, to repay outstanding indebtedness under the Company’s Amended Credit Agreement.

The New Credit Agreement, among other things, provides in its term loan provisions for a 5-year, $55 million senior secured term loan (the “Term Loan” or “Term Loan Facility”). The Term Loan is subject to repayment in quarterly installments commencing March 31, 2025, in amounts as set forth in the New Credit Agreement. Interest is payable on the unpaid principal outstanding under the Term Loan. All amounts of unpaid principal and accrued and unpaid interest remaining due under the Term Loan are scheduled to be paid in full October 31, 2029.

Upon closing of the Acquisition on October 31, 2024, the Company borrowed the full amount of the Term Loan Facility.

As of December 31, 2025, the Company had $50,250 outstanding principal on the Term Loan, $4,125 of which is included in current portion of long-term debt on the consolidated balance sheets, and no amounts outstanding on the Revolving Credit Facility. As of December 31, 2025, unamortized debt issuance costs associated with the Term Loan of $599 are classified on the consolidated balance sheets as a reduction of long-term debt, and unamortized debt issuance costs associated with the Revolving Credit Facility of $414 are classified on the consolidated balance sheets as other noncurrent assets. Debt issuance costs include lender fees and certain costs paid to third parties, including legal and accountant fees, and are amortized to interest expense over the term of the New Credit Agreement.

The New Credit Agreement also provides under its revolving credit provisions for revolving loans, letters of credit, and swing loans (“Revolving Credit Facility”). Upon the effectiveness of the New Credit Agreement, any amounts outstanding under letters of credit issued pursuant to the Amended Credit Agreement became issued under the New Credit Agreement. The availability under the Revolving Credit Facility is subject to certain borrowing base limits based on trade receivables and inventories. All unpaid principal and accrued and unpaid interest with respect to the Revolving Credit Facility is due and payable in full on October 31, 2029.

The Company may voluntarily prepay principal amounts outstanding under the New Credit Agreement at any time subject to certain advance notifications and other restrictions.

In addition to the customary affirmative and negative covenants, the Company must maintain a consolidated fixed charge coverage ratio, as defined in the New Credit Agreement, of equal to or greater than 1.15 to 1.00 for the fiscal quarter ending March 31, 2025, and for each fiscal quarter thereafter, as calculated for the four (4) consecutive fiscal quarters ending on such date, and a consolidated senior leverage ratio, as defined in the New Credit Agreement, not to exceed (i) 3.50 to 1.00 for the fiscal quarters ending March 31, 2025 through December 31, 2025, (ii) 3.25 to 1.00 for the fiscal quarters ending March 31, 2026 through December 31, 2026, (iii) 3.00 to 1.00 for the fiscal quarter ending March 31, 2027 and on the last day of each fiscal quarter thereafter, for the remaining term of the New Credit Agreement. The Company was in full compliance with its covenants under the New Credit Agreement as of December 31, 2025.

Borrowings under the New Credit Agreement are secured by substantially all the assets of the Company and certain of its present and future subsidiaries who are or become parties to, or guarantors under the new Credit Agreement.

Interest will accrue on outstanding indebtedness under the Term Loan Facility and Revolving Credit Facilities at a variable rate of interest based on designated interest rate benchmarks plus a varying margin determined by reference to the consolidated senior leverage ratio in effect from time to time. Our borrowing rate was 6.16% as of December 31, 2025.

The Company must pay a fee of twenty, twenty-five or thirty basis points (depending on the consolidated senior leverage ratio in effect from time to time) based on the average daily unused availability under the Revolving Credit Facility.

The Company must make payments to the extent borrowings exceed the maximum amount then permitted to be borrowed and from the proceeds of certain transactions. Upon the occurrence of an event of default, the outstanding obligations may be accelerated, and the Bank will have other customary remedies including resort to the security interest the Company provided to the Bank.

Future minimum principal repayment obligations on our Amended Credit Facilities as of December 31, 2025, are as follows:

2026	$	4,125
2027		5,500
2028		5,500
2029		35,125
Total	$	50,250

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Note 1 - Summary of Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment, Estimated Useful Life [Table Text Block]

Buildings		10	–	40
Machinery and Equipment		5	–	10
Furniture and Fixtures		3	–	10
Computer Hardware and Software		2	–	5
Leasehold Improvements	Lesser of useful life or lease term

Note 8 - Operating Leases - Supplement Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Operating cash flows from operating leases	$ 1,151	$ 1,108
Right-of-use assets obtained in exchange for lease liabilities:	$ 57	$ 1,706

Note 3 - Debt - Future Minimum Principal Repayment Obligations (Details) $ in Thousands	Dec. 31, 2025 USD ($)
2029	$ 35,125
Revolving Credit Facility [Member] \| Amended Credit Agreement [Member]
2026	4,125
2027	5,500
2028	5,500
Total	$ 50,250

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Note 2 - Acquisition (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Oct. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Payments to Acquire Businesses, Gross		$ (0)	$ 48,022
Cost of Revenue		145,138	122,142
Amortization of Intangible Assets		1,518	1,032
Electrochem Solutions, Inc. [Member]
Business Combination, Consideration Transferred	$ 50,000
Payments to Acquire Businesses, Gross	48,022
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	1,978
Business Combination, Recognized Liability Assumed, Lease Obligation	$ 230
Business Combination, Acquiree's Revenue since Acquisition Date, Actual		32,599	6,062
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual		997	932
Cost of Revenue		120	120
Amortization of Intangible Assets		625	119
Business Combination, Acquisition-Related Cost, Expense		$ 973	$ 1,294

Note 8 - Operating Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Operating lease cost	$ 1,166	$ 1,101
Variable lease cost	93	100
Total lease cost	$ 1,259	$ 1,201

Note 1 - Summary of Operations and Significant Accounting Policies

12 Months Ended

Dec. 31, 2025

Business Description and Accounting Policies [Text Block]

Note 1 - Summary of Operations and Significant Accounting Policies

a.	Description of Business

As used in this annual report, unless otherwise indicated, the terms the “Company”, “we”, “our” and “us” refer to Ultralife Corporation (“Ultralife”) and its wholly owned subsidiaries ABLE New Energy Co., Limited and its wholly owned subsidiary ABLE New Energy Co., Ltd (collectively “ABLE”); Ultralife UK LTD and its wholly owned subsidiary Accutronics Ltd (collectively “Accutronics”); Ultralife Batteries (UK) Ltd.; Southwest Electronic Energy Corporation and its wholly owned subsidiary, CLB, Inc. (collectively “SWE”); Ultralife Excell Holding Corp. (“UEHC”) and its wholly owned subsidiary Excell Battery Corporation USA (collectively “Excell Battery USA”); Ultralife Canada Holding Corp (wholly owned by UEHC, “UCHC”) and its wholly owned subsidiary Excell Battery Canada ULC (“Excell Battery Canada”); Electrochem Solutions, Inc. (“Electrochem”); and its majority-owned joint venture Ultralife Batteries India Private Limited (“Ultralife India”).

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 and its wholly owned subsidiaries ABLE, Accutronics, Ultralife Batteries (UK) Ltd., SWE, Excell, Electrochem, and its majority-owned joint venture Ultralife India. 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 excess and obsolete inventory, deferred tax assets, 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 no material reclassifications for the years ended December 31, 2025, and 2024.

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 Expected Credit Losses

We extend credit to our customers in the normal course of business. We perform ongoing credit evaluations and generally do not require collateral. Payment terms are generally thirty (30) to sixty (60) days. Trade accounts receivable are recorded at their invoiced amounts, net of allowance for expected credit losses. We evaluate the adequacy of our allowance for expected credit losses quarterly. Accounts outstanding for longer than contractual payment terms are considered past due and are reviewed for collectability. We maintain reserves for potential credit losses based upon our historical experience, aging profile and general market conditions. Receivable balances are written off when collection is deemed unlikely.

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 is stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives. Estimated useful lives are as follows (in years):

Buildings		10	–	40
Machinery and Equipment		5	–	10
Furniture and Fixtures		3	–	10
Computer Hardware and Software		2	–	5
Leasehold Improvements	Lesser of useful life or lease term

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 our long-lived assets for impairment whenever 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. If the expected undiscounted future cash flows exceed the respective carrying amount as of the date of assessment, no impairment is recognized. Should aggregate undiscounted 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 in our evaluation is an industry-based weighted average cost of capital.

Under the acquisition method of accounting, the purchase price paid, or the total consideration transferred, to consummate the acquisition is allocated to the identified tangible and intangible assets acquired and liabilities assumed based on their respective estimated fair values as of the acquisition date with the residual amount recorded to goodwill. We do not amortize goodwill and intangible assets with indefinite lives, but instead evaluate these assets for impairment at least annually, or whenever events or circumstances indicate that impairment may exist. We amortize intangible assets that have definite lives so that the economic benefits of the intangible assets are being recognized over their estimated useful life.

The annual impairment test for goodwill consists of a comparison of the estimated fair value for each reporting unit to which goodwill is assigned to the carrying value of the respective reporting unit. The annual impairment test for other indefinite-lived intangible assets consists of a comparison of the estimated fair value of each asset to the carrying value of the respective asset. If the estimated fair value of a reporting unit or other indefinite-lived intangible asset exceeds its respective carrying value, the goodwill or indefinite-lived intangible asset is considered not impaired. If carrying value of a reporting unit or indefinite-lived intangible asset exceeds its estimated fair value, the excess carrying value of the respective goodwill or indefinite-lived intangible asset is recognized as an impairment loss.

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 income (loss). Exchange gains and losses related to foreign currency transactions and balances denominated in currencies other than the functional currency are recognized in net income (loss).

k.	Revenue Recognition

Revenues are generated from the sale of products. Performance obligations are met and revenue is recognized upon transfer of control to the customer, which is generally upon shipment. When contract terms require transfer of control upon delivery at a customer’s location, revenue is recognized on the date of delivery. For products shipped under vendor managed inventory arrangements, revenue is recognized and billed when the product is consumed by the customer, at which point control has transferred and there are no further obligations by the Company. Revenue is measured as the amount of consideration we expect to receive in exchange for shipped product. Sales, value-added and other taxes billed and collected from customers are excluded from revenue. Customers, including distributors, do not have a general right of return.

Separately priced extended warranty contracts are offered on certain Communications Systems products for a duration of up to eight (8) years. Extended warranties are treated as separate performance obligations and recognized to revenue evenly over the term of the respective contract. Revenue not yet recognized on extended warranty contracts is recorded as deferred revenue on the consolidated balance sheets. For the years ended December 31, 2025, and 2024, revenue recognized on extended warranties was $298 and $298, respectively.

As of December 31, 2025, there was deferred revenue on extended warranty contracts of $855, comprised of $298 expected to be recognized as revenue within one (1) year and classified as accrued expenses and other current liabilities on our consolidated balance sheets, and $557 expected to be recognized as revenue over the remaining duration of the respective contracts and classified as other noncurrent liabilities on our consolidated balance sheets.

As of December 31, 2025, and 2024, the Company had no other unsatisfied performance obligations for contracts with an original expected duration of greater than one year. Pursuant to Topic 606, we have applied the practical expedient with respect to disclosure of the deferral and future expected timing of revenue recognition for transaction price allocated to remaining performance obligations.

l.	Warranty Reserves

We typically offer standard warranties against product defects that range from ninety (90) days to three (3) years from the date of purchase. We also offer separately priced extended warranty contracts on certain products. Warranty costs expected to be incurred are estimated based on the Company’s experience and recorded as costs of products sold. Standard warranty costs are recognized upon product sale. Extended warranty costs are recognized over the term of the contract. Provision for warranty costs is recorded in accrued expenses and other current liabilities and other noncurrent liabilities on our consolidated balance sheets based on the duration of the warranty.

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.	Sales Commissions

Sales commissions are expensed as incurred for contracts with an expected duration of one year or less. There were no sales commissions capitalized as of December 31, 2025, and 2024.

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. For the years ended December 31, 2025, and 2024, we expended $12,079 and $9,549, respectively, on research and development, including costs of $1,681 and $1,281, respectively, on customer sponsored research and development activities, which are included in cost of products sold.

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. Pursuant to ASC 740, a valuation allowance is recognized when the realizability of deferred tax assets is not more likely than not, based all available evidence, both positive and negative, weighted based on objective verifiability.

r.	Concentration Related to Customers and Suppliers

One of our customers, a large global defense primary contractor, comprised 27% and 23% of our total consolidated revenues for 2025 and 2024, respectively. Revenues for this customer represented 29% and 24% of our total Battery & Energy Products segment revenues for 2025 and 2024, respectively. There were no other customers that comprised greater than 10% of our total consolidated revenues during these years.

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 1:	Quoted prices in active markets for identical assets or liabilities.

	Level 2:	Observable inputs, other than Level 1 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 3:	Unobservable inputs supported by little or no 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, 2025, and 2024. The fair value of cash, accounts receivable, accounts payable, accrued liabilities, and the current portion of long-term debt approximates carrying value due to the short-term nature of these instruments. The carrying value of long-term debt approximates fair value, as the variable interest rates approximate current market rates.

t.	Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income (loss) attributable to Ultralife Corporation by the weighted average shares of common stock outstanding for the period. Diluted EPS reflects the assumed exercise and conversion of dilutive outstanding stock options and unvested restricted stock, if any, applying the treasury stock method.

For the year ended December 31, 2025, there were no outstanding equity awards included in the calculation of diluted weighted average shares outstanding and no potential common shares included in the calculation of diluted EPS, as no securities were dilutive. There were 967,351 outstanding stock options and 40,343 unvested restricted stock awards not included in the calculation of EPS for the year ended December 31, 2025, as the effect would be antidilutive.

For the comparable year ended December 31, 2024, there were 770,376 outstanding stock options and 38,386 unvested restricted stock awards included in the calculation of diluted weighted average shares outstanding, as such securities were dilutive, resulting in 212,197 potential common shares included in the calculation of diluted EPS. There were 336,060 outstanding stock options for the year ended December 31, 2024, not included in EPS as the effect would be antidilutive.

u.	Stock-Based Compensation

We have various stock-based employee compensation plans that are described more fully in Note 6. 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.	Business Combinations

We allocate the purchase price of acquired businesses to the tangible and intangible assets acquired and the liabilities assumed based on their estimated fair values on the acquisition date. Any excess of the purchase price over the net fair value of the separately identifiable assets acquired and liabilities assumed is allocated to goodwill. Management determines the fair values of identifiable intangible assets acquired based on historical data, estimated discounted future cash flows, expected royalty rates for trademarks and trade names, as well as certain other information. The valuation of assets acquired and liabilities assumed requires a number of judgments and is subject to change as additional information about the fair value of assets and liabilities becomes available. Additional information, which existed as of the acquisition date but unknown to us at that time, may become known during the remainder of the measurement period. This measurement period may not exceed twelve months from the acquisition date. We will recognize any adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustments are determined. Additionally, in the same period in which adjustments are recognized, we will record the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of any change to the provisional amounts, calculated as if the accounting adjustment had been completed at the acquisition date. Acquisition costs are expensed as incurred. The results of operations and cash flows of acquired businesses are included in our consolidated financial statements from the date of acquisition.

Leases

At contract inception, the Company determines whether the arrangement is or contains a lease and determines the lease classification. The lease term is determined based on the non-cancellable term of the lease adjusted to the extent optional renewal terms and termination rights are reasonably certain. Lease expense for operating leases is recognized evenly over the lease term. Variable lease payments are recognized as period costs. The present value of remaining lease payments is recognized as a liability on the balance sheet with a corresponding right-of-use asset adjusted for prepaid or accrued lease payments. The Company uses its incremental borrowing rate for the discount rate, unless the interest rate implicit in the lease contract is readily determinable. The Company has adopted the practical expedients to not separate non-lease components from lease components and to not present short-term leases on the balance sheet. See Note 8 for further disclosure regarding lease accounting.

y.	Recent Accounting Pronouncements

Recently Adopted Accounting Guidance

In November 2023, the FASB issued ASU 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” to expand the disclosure requirements for reportable segments. The standard expands reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment operating profit (loss). This standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The adoption of this new accounting standard did not have an impact on the Company's results of operations, financial position or cash flows.

In December 2023, the FASB issued ASU 2023-09 "Income Taxes (Topics 740): Improvements to Income Tax Disclosures" to expand the disclosure requirements for income taxes, specifically related to the rate reconciliation and income taxes paid. ASU 2023-09 is effective for the Company’s annual reporting period beginning January 1, 2025, with early adoption permitted and the Company adopted it as required on January 1, 2025. The adoption of this new accounting standard did not have an impact on the Company's results of operations, financial position or cash flows.

Recent Accounting Guidance Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03 “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses” which requires public entities to disclose specified information about certain costs and expenses. ASU 2024-03 is effective for the Company’s annual reporting period beginning January 1, 2027, and interim reporting periods beginning January 1, 2028, with early adoption permitted. The Company is currently evaluating the impact that ASU 2024-03 will have on its consolidated financial statements.

Award Timing Disclosure	12 Months Ended
Award Timing Disclosure	Dec. 31, 2025
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Award Timing, How MNPI Considered [Text Block]	ITEM 11. EXECUTIVE COMPENSATION The sections entitled “Executive Compensation”, “Directors Compensation”, “Employment Arrangements” and “Compensation and Management Committee” in the Proxy Statement are incorporated herein by reference.
Award Timing MNPI Considered [Flag]	true

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
OPERATING ACTIVITIES:
Net income	$ (5,951)	$ 6,409
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	3,981	3,125
Amortization of intangible assets	1,518	1,032
Intangible asset impairment	12,181	0
Amortization of financing fees	265	91
Debt modification expense	0	162
Stock-based compensation	935	698
Deferred income tax expense	(2,541)	1,232
Deferred income tax expense
Accounts receivable	(4,354)	7,599
Inventories	(2,345)	(109)
Prepaid expenses and other assets	1,687	(3,754)
Income taxes receivable and payable	(170)	(64)
Accounts payable and other liabilities	5,784	215
Net cash provided by operating activities	10,990	16,636
INVESTING ACTIVITIES:
Purchase of Electrochem	0	(48,022)
Purchases of property, plant and equipment	(3,872)	(1,932)
Net cash used in investing activities	(3,872)	(49,954)
FINANCING ACTIVITIES:
Borrowings on credit facility	0	55,000
Payment of debt issuance costs	24	1,392
Proceeds from exercise of stock options	98	1,999
Net cash used in financing activities	(4,676)	29,860
Effect of exchange rate changes on cash
Effect of exchange rate changes on cash	49	34
INCREASE (DECREASE) IN CASH	2,491	(3,424)
Cash - Beginning of year	6,854	10,278
Cash - End of year	9,345	6,854
Supplemental cash flow information:
Construction in process in accounts payable	424	248
Income taxes paid	147	722
Interest paid	3,689	1,855
Revolving Credit Facility [Member]
FINANCING ACTIVITIES:
Payments on credit facilities	$ (4,750)	$ (25,747)

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Trade accounts receivable, allowance for doubtful accounts	$ 457	$ 384
Preferred stock, par value (in dollars per share)	$ 0.1	$ 0.1
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)	$ 0.1	$ 0.1
Common Stock, Shares Authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	21,092,617	21,069,079
Common stock, shares outstanding (in shares)	16,656,503	16,632,965
Treasury Stock, Common, Shares (in shares)	4,436,114	4,436,114

Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

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

	Year ended December 31,
	2025			2024
Current:
Federal	$	12		$	-
State		48			50
Foreign	34				610
	94				660
Deferred:
Federal	(1,802		)		1,313
State	(248		)		58
Foreign	(491		)		(139	)
	(2,541		)		1,232
Total income tax (benefit) provision	$	(2,447	)	$	1,892

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

	December 31,
	2025			2024
Deferred tax assets:
Net operating loss carryforwards	$	4,809		$	5,817
Research and development	5,448				4,894
Tax credit carryforwards	3,448				3,180
Inventory reserves	2,991				2,859
Intangible assets	610				1,678
Lease Liability	728				905
Accrued expenses and other	1,318				1,542
Total deferred tax assets	19,352				20,875
Valuation allowance for deferred tax assets	(2,530		)		(2,404	)
Net deferred tax assets	16,822				18,471

Deferred tax liabilities:
Intangible assets	(5,619		)		(9,480	)
Property, plant and equipment	(980		)		(1,113	)
Right of use asset	(729		)		(908	)
Total deferred tax liabilities	(7,328		)		(11,501	)

Net deferred tax assets	$	9,494		$	6,970

Schedule of Net Deferred Tax Liabilities [Table Text Block]

	December 31,
	2025			2024

Deferred tax assets, net	$	10,494		$	8,413
Deferred tax liabilities	(1,000		)		(1,443	)
	$	9,494		$	6,970

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

	Year ended December 31,
	2025			2024
United States	$	(5,863	)	$	7,044
Foreign	(2,535		)		1,257
	$	(8,398	)	$	8,301

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

	Year ended December 31, 2025

Federal statutory income tax rate	$	(1,763	)	21.0	%
State and local income taxes, net of federal income tax effect (a)		(204	)	2.4
Nontaxable or nondeductible items:
Equity compensation		136		(1.6	)
Nontaxable refund credit		(296	)	3.5
Other		14		(0.2	)
Other reconciling items		(127	)	1.5
Tax credits:
R&D		(267	)	3.2
Cross-border tax laws:		(20	)	0.2
Foreign tax effects:
China
R&D deduction		(103	)	1.2
Other		(8	)	0.1
Hong Kong
Tax rate differential		131		(1.5	)
Canada
Tax rate differential		164		(2.0	)
Provincial taxes		(303	)	3.6
Change in functional currency		170		(2.0	)
Other		20		(0.2	)
Other foreign jurisdictions		9		(0.1	)
Effective income tax rate	$	(2,447	)	29.1	%

	Year ended December 31,
	2024

Statutory income tax rate		21.0	%
Increase (decrease) in tax provision resulting from:
Equity compensation		0.5
Global intangible low-taxed income		0.7
China R&D deduction		(1.1	)
Income tax credits		(3.6	)
Tax rate changes		(0.1	)
Foreign exchange loss		0.8
Foreign tax rates		2.3
States taxes		1.1
Transaction costs		0.7
Other		0.5
Effective income tax rate		22.8	%

Schedule of Income Taxes Paid [Table Text Block]

	Year ended December 31,
	2025

Federal	$	34
State		49
Foreign:
Canada		126
China		-
United Kingdom		(91	)
India		29
Total foreign		64
Total income taxes paid, net of refunds	$	147

Note 5 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2025

Schedule of Product Warranty Liability [Table Text Block]

	2025			2024
Accrued warranty obligations – beginning	$	887		$	547
Accruals for warranties issued		656			1,149
Settlements made		(417	)		(809	)
Accrued warranty obligations - ending	$	1,126		$	887

Note 8 - Operating Leases

12 Months Ended

Dec. 31, 2025

Lessee, Operating Leases [Text Block]

Note 8 – Operating Leases

The Company has operating leases predominantly for operating facilities. As of December 31, 2025, the remaining lease terms on our operating leases range from approximately one (1) year to seven (7) years. Lease terms include renewal options reasonably certain of exercise. There is no transfer of title or option to purchase the leased assets upon expiration. There are no residual value guarantees or material restrictive covenants.

The components of lease expense for the current and prior-year comparative periods were as follows:

	Year ended December 31,
	2025		2024
Operating lease cost	$	1,166	$	1,101
Variable lease cost		93		100
Total lease cost	$	1,259	$	1,201

Supplemental cash flow information related to leases was as follows:

	Year ended December 31,
	2025		2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,151	$	1,108
Right-of-use assets obtained in exchange for lease liabilities:	$	57	$	1,706

Supplemental balance sheet information related to leases was as follows:

		December 31,
	Balance Sheet Classification	2025			2024
Assets:
Operating lease right-of-use asset	Other noncurrent assets	$	3,344		$	4,153

Liabilities:
Current operating lease liability	Accrued expenses and other current liabilities	$	976		$	1,138
Operating lease liability, net of current portion	Other noncurrent liabilities		2,357			2,998
Total operating lease liability		$	3,333		$	4,136

Weighted-average remaining lease term (years)			4.1			4.5

Weighted-average discount rate			7.1	%		6.7	%

Future minimum lease payments as of December 31, 2025, are as follows:

Maturity of Operating Lease Liabilities
2026	$	1,013
2027		944
2028		933
2029		580
2030		156
Thereafter		196
Total lease payments	$	3,822
Less: Imputed interest		(489	)
Present value of remaining lease payments	$	3,333

Note 6 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2025

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

	Year ended December 31,
	2025		2024
Stock options	$	770	$	640
Restricted stock		165		58
Total	$	935	$	698

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

	Year ended December 31,
	2025		2024
Risk-free interest rate		-		4.3	%
Volatility factor		-		58	%
Weighted average expected life (years)		-		4.7
Forfeiture rate		-		10.0	%
Dividends		-		0.0	%

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

Year ended December 31, 2025
	Number of shares			Weighted average exercise price per share		Weighted average remaining contractual term		Aggregate intrinsic value
Shares under option – January 1		1,106,436		$	7.15
Options granted		-			-
Options exercised		(15,982	)		6.10
Options forfeited or expired		(123,103	)		8.87
Shares under option – December 31		967,351		$	6.95		3.80	$	83
Vested and expected to vest - December 31		911,744		$	6.92		3.69	$	81

Options exercisable – December 31		737,972		$	6.78		3.23	$	76

Year ended December 31, 2024
	Number of shares			Weighted average exercise price per share		Weighted average remaining contractual term		Aggregate intrinsic value
Shares under option – January 1		1,250,595		$	7.10
Options granted		261,520			7.85
Options exercised		(298,293	)		7.08
Options forfeited or expired		(107,386	)		8.41
Shares under option – December 31		1,106,436		$	7.15		4.53	$	741
Vested and expected to vest - December 31		1,003,942		$	7.17		4.36	$	674

Options exercisable – December 31		625,826		$	7.18		3.18	$	477

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

			Option outstanding						Options exercisable
Range of exercise prices			Number of outstanding options		Weighted-average remaining contractual life		Weighted- average exercise price		Number of options exercisable		Weighted- average exercise price
$4.07	-	$6.51		301,804		2.94	$	5.69		297,638	$	5.72
$6.84	-	$6.97		291,853		4.16		6.88		228,453		6.89
$7.86	-	$7.86		242,780		5.95		7.86		80,967		7.86
$8.25	-	$8.50		130,914		1.01		8.34		130,914		8.34

$4.07	-	$8.50		967,351		3.80	$	6.95		737,972	$	6.78

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2023	20,783,607
Balance at Dec. 31, 2023	$ 2,078	$ 189,160	$ (3,660)	$ (40,754)	$ (21,492)	$ 95	$ 125,427
Net income				6,312		97	$ 6,409
Stock Issued During Period, Value, Stock Options Exercised (in shares)	285,472						298,293
Stock option exercises	$ 29	1,970					$ 1,999
Stock-based compensation – stock options		640					640
Stock-based compensation – restricted stock		58					58
Foreign currency translation adjustments adjustments			(346)				$ (346)
Balance (in shares) at Dec. 31, 2024	21,069,079						16,632,965
Balance at Dec. 31, 2024	$ 2,107	191,828	(4,006)	(34,442)	(21,492)	192	$ 134,187
Net income				(5,898)		(53)	$ (5,951)
Stock Issued During Period, Value, Stock Options Exercised (in shares)	15,982						15,982
Stock option exercises	$ 2	96			0		$ 98
Stock-based compensation – stock options		770					770
Stock-based compensation – restricted stock	$ 7,556	165					165
Foreign currency translation adjustments adjustments			865				$ 865
Balance (in shares) at Dec. 31, 2025	21,092,617						16,656,503
Balance at Dec. 31, 2025	$ 2,109	$ 192,859	$ (3,141)	$ (40,340)	$ (21,492)	$ 139	$ 130,134

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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Note 1 - Summary of Operations and Significant Accounting Policies - Property, Plant and Equipment (Details)	Dec. 31, 2025
Building [Member] \| Minimum [Member]
Useful life (Year)	10 years
Building [Member] \| Maximum [Member]
Useful life (Year)	40 years
Machinery and Equipment [Member] \| Minimum [Member]
Useful life (Year)	5 years
Machinery and Equipment [Member] \| Maximum [Member]
Useful life (Year)	10 years
Furniture and Fixtures [Member] \| Minimum [Member]
Useful life (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Useful life (Year)	10 years
Computer Equipment [Member] \| Minimum [Member]
Useful life (Year)	2 years
Computer Equipment [Member] \| Maximum [Member]
Useful life (Year)	5 years

Note 7 - Income Taxes - United States and Foreign Income (Loss) From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
United States	$ (5,863)	$ 7,044
Foreign	(2,535)	1,257
(Loss) income before income taxes	$ (8,398)	$ 8,301

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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