Document And Entity Information Note To Financial Statement Details Textual us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths 2024 Significant Accounting Policies us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2025 Note 4 - Supplemental Balance Sheet Information Note 5 - Stock-based Compensation Note 7 - Operating Leases Note 8 - Commitments and Contingencies Note 10 - Business Segment Information Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) Note 4 - Supplemental Balance Sheet Information - Components of Inventory (Details) Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) Income Tax Disclosure [Text Block] Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) ulbi_LineOfCreditFacilityMaximumBorrowingCapacityContingentOnBankApproval Line Of Credit Facility Maximum Borrowing Capacity Contingent On Bank Approval Represents line of credit facility maximum borrowing capacity contingent on bank approval. Note 4 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) Other noncurrent assets us-gaap_OtherAssetsNoncurrent Stock-based compensation us-gaap_ShareBasedCompensation Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] us-gaap_LiabilitiesCurrent Total current liabilities us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear 2023 Note 4 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) Note 5 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) Note 5 - Stock-based Compensation - Stock Option Activity (Details) Note 7 - Operating Leases - Lease Cost (Details) Accrued expenses and other current liabilities us-gaap_OtherLiabilitiesCurrent Note 7 - Operating Leases - Supplement Cash Flow Information Related to Leases (Details) Note 7 - Operating Leases - Supplemental Balance Sheet Information Related to Leases (Details) Note 7 - Operating Leases - Future Minimum Lease Payments (Details) Note 8 - Commitments and Contingencies - Changes in Product Warranty Liability (Details) Note 10 - Business Segment Information - Segment Activity (Details) Revenues us-gaap_Revenues Purchase Commitment, Excluding Long-Term Commitment [Axis] Operating expenses: Purchase Commitment, Excluding Long-Term Commitment [Domain] Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Notes To Financial Statements Notes To Financial Statements [Abstract] Foreign currency translation adjustments us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vested and expected to vest, weighted average remaining contractual term (Year) Depreciation Current portion of long-term debt Vested and expected, weighted average exercise price (in dollars per share) Other comprehensive income (loss): Exercisable, aggregate intrinsic value Vested and expected to vest, shares (in shares) Vested and expected to vest, aggregate intrinsic value us-gaap_AssetsCurrent Total current assets Exercisable, weighted average remaining contractual term (Year) us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Total shareholders’ equity Balance Balance Exercisable, shares (in shares) Outstanding, weighted average remaining contractual term (Year) Outstanding, aggregate intrinsic value Treasury Stock, Common, Shares (in shares) Common stock – par value $.10 per share; authorized 40,000,000 shares; issued – 20,570,710shares at March 31, 2023 and 20,570,710 shares at December 31, 2022; outstanding – 16,135,358 shares at March 31, 2023 and 16,135,358shares at December 31, 2022 Adjustments to reconcile net loss to net cash (used in) provided by operating activities: us-gaap_SecuredDebtCurrent Secured Debt, Total us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, weighted average exercise price (in dollars per share) Outstanding, weighted average exercise price (in dollars per share) Common Stock, Shares Authorized (in shares) Forfeited or expired, weighted average exercise price (in dollars per share) Common stock, shares issued (in shares) Common stock, par value (in dollars per share) Granted, weighted average exercise price (in dollars per share) Schedule of Goodwill [Table Text Block] Exercised, weighted average exercise price (in dollars per share) Accrued compensation and related benefits us-gaap_EmployeeRelatedLiabilitiesCurrent us-gaap_DeferredTaxAssetsValuationAllowance Deferred Tax Assets, Valuation Allowance Statistical Measurement [Domain] Operating cash flows from operating leases Maximum [Member] Minimum [Member] Lessee, Operating Leases [Text Block] Accounts payable us-gaap_AccountsPayableCurrent Revolving Credit Facility [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Outstanding, shares (in shares) Outstanding, shares (in shares) Statistical Measurement [Axis] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod Forfeited or expired, shares (in shares) Credit Facility [Axis] Preferred stock – par value $.10 per share; authorized 1,000,000 shares; none issued Credit Facility [Domain] Trademarks [Member] Preferred Stock, Shares Issued (in shares) Cash, Cash Equivalents and Investments [Table Text Block] us-gaap_PolicyTextBlockAbstract Accounting Policies KeyBank [Member] Related to the lender KeyBank. Geographical [Axis] Geographical [Domain] Property, Plant and Equipment [Table Text Block] Preferred Stock, Shares Authorized (in shares) Trade Names [Member] Inventories, net Total Preferred stock, par value (in dollars per share) Other Intangible Assets [Member] Revenues us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property, plant and equipment us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Lessee, Lease, Cash Flow Information [Table Text Block] Tabular disclosure of cash flow information related lessee's lease . Customer [Axis] Customer [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) Lessee, Lease, Balance Sheet Information [Table Text Block] Tabular disclosure of balance sheet information related lessee's lease . us-gaap_ProductWarrantyAccrualPayments Settlements made Current liabilities: Supplemental Balance Sheet Disclosures [Text Block] us-gaap_ExtendedProductWarrantyAccrual Extended Product Warranty Accrual Patented Technology [Member] us-gaap_Assets Total assets Stock-based compensation – restricted stock This element represents the amount of recognized equity-based compensation related to restricted stock options during the period. Accruals for warranties issued Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Plan Name [Axis] us-gaap_ExtendedProductWarrantyAccrualCurrent Extended Product Warranty Accrual, Current Shareholders' Equity and Share-Based Payments [Text Block] Plan Name [Domain] us-gaap_ExtendedProductWarrantyAccrualNoncurrent Extended Product Warranty Accrual, Noncurrent Non-controlling interest Construction in Progress [Member] OPERATING ACTIVITIES: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Customer Relationships [Member] Schedule of Segment Reporting Information, by Segment [Table Text Block] Statement [Line Items] Trade accounts receivable, allowance for doubtful accounts Trade accounts receivable, net of allowance for expected credit losses of $308 and $303, respectively Furniture and Fixtures [Member] us-gaap_NumberOfOperatingSegments Number of Operating Segments Capital in excess of par value Building and Building Improvements [Member] Deferred income taxes, net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Shareholders’ equity: Schedule of Product Warranty Liability [Table Text Block] Land [Member] us-gaap_InterestAndDebtExpense Interest and financing expense Miscellaneous income us-gaap_NonoperatingIncomeExpense Total other income (expense) Other income Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Domain] Segment Reporting Disclosure [Text Block] Award Type [Domain] Government & Defense [Member] Represents information pertaining to the Government and Defense customer. Business Description and Accounting Policies [Text Block] Revenue, percentage The percentage of total revenue for the period. Commercial [Member] Represents information pertaining to the Commercial customer. Current assets: Restricted cash us-gaap_RestrictedCashAndCashEquivalents Restricted Cash and Cash Equivalents Net loss attributable to Ultralife Net income attributable to Ultralife Net income attributable to Ultralife Corporation Award Type [Axis] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Total Cash, Beginning of period Cash, End of period Accumulated Amortization Net Schedule of Revenues from External Customers by Business Segment Sector [Table Text Block] Tabular disclosure of material revenue from specific sectors of each business segment. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect INCREASE (DECREASE) IN CASH Cost us-gaap_Liabilities Total liabilities Net income (loss) attributable to non-controlling interest Non-controlling interest Non-controlling interest us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities Restricted Stock [Member] Effect of exchange rate changes on cash Segment contribution us-gaap_OperatingIncomeLoss Operating income Other income (expense): us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash used in operating activities Share-Based Payment Arrangement, Option [Member] Prepaid expenses and other current assets us-gaap_PrepaidExpenseAndOtherAssetsCurrent us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_GoodwillForeignCurrencyTranslationGainLoss Effect of foreign currency translation Cost of products sold Antidilutive Securities [Axis] us-gaap_GrossProfit Gross profit Antidilutive Securities, Name [Domain] Deferred income taxes us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less: Accumulated depreciation Commitments and Contingencies Disclosure [Text Block] Property, plant and equipment, net Property, plant and equipment, net Goodwill Balance Balance Property, plant and equipment, gross us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Tax withholdings on stock-based awards Secured Overnight Financing Rate (SOFR) [Member] Interest rate based on U.S. Treasury repurchases between banks. Foreign currency translation adjustments adjustments AOCI Including Portion Attributable to Noncontrolling Interest [Member] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProductWarrantyAccrual Accrued warranty obligations – beginning Accrued warranty obligations – ending Noncontrolling Interest [Member] INVESTING ACTIVITIES: The 2014 Long-term Incentive Plan [Member] Represents the long-term incentive stockholder's equity compensation plan. Retained Earnings [Member] Earnings Per Share [Text Block] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Treasury Stock, Common [Member] us-gaap_DeferredFinanceCostsGross Debt Issuance Costs, Gross Additional Paid-in Capital [Member] Common Stock [Member] Income tax provision (benefit) Tax benefit Tax benefit Equity Components [Axis] Equity Component [Domain] Other Noncurrent Assets [Member] Other Noncurrent Liabilities [Member] us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before income taxes ulbi_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour Thereafter Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Accrued Expenses and Other Current Liabilities [Member] Related to accrued expenses and other current liabilities. Accrued Expenses and Other Current Liabilites and Other Noncurrent Liabilities [Member] Related to accured expenses and other current liabilities and other noncurrent liabilities. us-gaap_OperatingExpenses Total operating expenses us-gaap_DebtInstrumentTerm Debt Instrument, Term Capital Addition Purchase Commitments [Member] The amount of capital addition purchase commitments. us-gaap_LineOfCredit Long-Term Line of Credit, Total us-gaap_PaymentsOfDebtIssuanceCosts Payment of debt issuance costs Her Majesty's Revenue and Customs (HMRC) [Member] Cash us-gaap_Cash Cash us-gaap_CashAndCashEquivalentsAtCarryingValue State and Local Jurisdiction [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] us-gaap_SecuredDebt Secured Debt, Total Internal Revenue Service (IRS) [Member] Income Tax Authority [Axis] Income Tax Authority [Domain] Stock options Domestic Tax Authority [Member] Foreign Tax Authority [Member] Revenue from Contract with Customer [Text Block] Machinery and Equipment [Member] Computer Equipment [Member] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Document Quarterly Report Entity Incorporation, State or Country Code Amendment Flag us-gaap_UnrecognizedTaxBenefits Unrecognized Tax Benefits, Ending Balance Accounting Policies [Abstract] us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income (loss) attributable to Ultralife Corporation us-gaap_OpenTaxYear Open Tax Year Document Transition Report City Area Code New Accounting Pronouncements, Policy [Policy Text Block] Selling, General and Administrative Expenses [Member] dei_EntityInteractiveDataCurrent Entity Interactive Data Current Accounts payable and other liabilities Security Exchange Name Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Title of 12(b) Security Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate Variable lease cost us-gaap_LeaseCost Total lease cost Research and Development Expense [Member] Weighted-average discount rate Document Fiscal Period Focus Operating lease cost Document Fiscal Year Focus us-gaap_IncreaseDecreaseInDeferredIncomeTaxes Deferred income taxes Lease, Cost [Table Text Block] dei_DocumentPeriodEndDate Document Period End Date Income Statement Location [Axis] Right-of-use assets obtained in exchange for lease liabilities: us-gaap_IncreaseDecreaseInPrepaidExpense Prepaid expenses and other assets Income Statement Location [Domain] Weighted-average remaining lease term (years) (Year) dei_EntityFileNumber Entity File Number Entity Emerging Growth Company us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount dei_DocumentType Document Type Entity Small Business dei_EntityShellCompany Entity Shell Company Document Information [Line Items] Document Information [Table] Entity Filer Category Debt Instrument [Axis] dei_EntityCurrentReportingStatus Entity Current Reporting Status Debt Instrument, Name [Domain] Segments [Axis] Segments [Domain] Corporate Segment [Member] Potential common shares (in shares) Variable Rate [Domain] us-gaap_TaxCreditCarryforwardAmount Tax Credit Carryforward, Amount us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Weighted average shares outstanding - diluted (in shares) us-gaap_RepaymentsOfLinesOfCredit Payments on term loan facility Variable Rate [Axis] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Entity Tax Identification Number Non-US [Member] Entity Central Index Key us-gaap_OperatingLossCarryforwards Operating Loss Carryforwards dei_EntityRegistrantName Entity Registrant Name Borrowings on revolving credit facility Stock-based compensation – stock options Entity [Domain] Legal Entity [Axis] Statement [Table] Entity Address, Address Line One Statement of Financial Position [Abstract] Net income per share attributable to Ultralife common stockholders – diluted (in dollars per share) Weighted average shares outstanding – basic (in shares) Amortization of intangible assets Entity Address, City or Town NETHERLANDS us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent Entity Address, Postal Zip Code us-gaap_TreasuryStockCommonValue Treasury stock - at cost; 4,435,352 shares at March 31, 2023 and 4,435,352 shares at December 31, 2022 Net income per share attributable to Ultralife common stockholders – basic (in dollars per share) Entity Address, State or Province Statement of Cash Flows [Abstract] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] us-gaap_LesseeOperatingLeaseRemainingLeaseTerm Lessee, Operating Lease, Remaining Lease Term (Year) us-gaap_IncreaseDecreaseInInventories Inventories Trading Symbol Local Phone Number Stock option exercises (in shares) Exercised, shares (in shares) us-gaap_TableTextBlock Notes Tables Vesting of restricted stock (in shares) us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Stock option exercises Vesting of restricted stock us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Selling, general and administrative FINANCING ACTIVITIES: Granted, shares (in shares) Other noncurrent liabilities us-gaap_OtherLiabilitiesNoncurrent Line of Credit Facility, Lender [Domain] Raw materials Lender Name [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and shareholders’ equity ulbi_MaximumConsolidatedSeniorLeverageRatio Maximum Consolidated Senior Leverage Ratio Represents information related to consolidated senior leverage ratio. Term Loan Facility [Member] Represents information related to term loan facility. Finished goods Amended Credit Agreement [Member] Represents information related to Amended Credit Agreement. Work in process UNITED STATES Long-term Debt, Current Maturities [Member] Represents Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligation Accumulated deficit us-gaap_ResearchAndDevelopmentExpense Research and development Accumulated other comprehensive loss Changes in operating assets and liabilities: Debt Disclosure [Text Block] Communications Systems Segment [Member] Represents the company's communications systems segment. Battery & Energy Products Segment [Member] Represents the company's battery & energy products segment. us-gaap_StockholdersEquity Total Ultralife Corporation equity Amortization of financing fees us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Operating lease liability, net of current portion Schedule of Inventory, Current [Table Text Block] Class of Stock [Axis] Long-term debt Total operating lease liability Present value of remaining lease payments Current operating lease liability Other intangible assets, net Exercisable, weighted average exercise price (in dollars per share) Operating lease right-of-use asset us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease payments ulbi_DilutiveSecuritiesIncludedInComputationOfEarningsPerShareAmount Dilutive Securities Included in Computation of Earnings Per Share Amount Stock Option Number of employee stock options included in calculation of diluted earnings per share. us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: Imputed interest us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree 2026 us-gaap_LongTermPurchaseCommitmentAmount Long-Term Purchase Commitment, Amount ulbi_DilutiveSecuritiesIncludedInComputationOfEarningsPerShareAmountRestrictedStock Dilutive Securities Included in Computation of Earnings Per Share Amount Restricted Stock Number of restricted shares included in calculation of diluted earnings per share. us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour 2027