Ultralife (ULBI) 10-K21 Mar 242023 FY Annual reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2023	Mar. 18, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	0-20852
Entity Registrant Name	ULTRALIFE CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1387013
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
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	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 46,718,255
Entity Common Stock, Shares Outstanding (in shares)		16,446,832
Auditor Name	Freed Maxick CPAs, P.C.
Auditor Location	Rochester, New York
Auditor Firm ID	317
Entity Central Index Key	0000875657
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 10,278	$ 5,713
Trade accounts receivable, net of allowance for doubtful accounts of $303 and $346, respectively	31,761	27,779
Inventories, net	42,215	41,192
Prepaid expenses and other current assets	5,949	4,304
Total current assets	90,203	78,988
Property, plant and equipment, net	21,117	21,716
Goodwill	37,571	37,428
Other intangible assets, net	15,107	15,921
Deferred income taxes, net	10,567	12,069
Other noncurrent assets	3,711	2,308
Total assets	178,276	168,430
Current Liabilities:
Accounts payable	11,336	16,074
Current portion of long-term debt	2,000	2,000
Accrued compensation and related benefits	3,115	2,890
Accrued expenses and other current liabilities	7,279	7,949
Total current liabilities	23,730	28,913
Long-term debt, net	23,624	19,310
Deferred income taxes	1,714	1,917
Other noncurrent liabilities	3,781	1,887
Total liabilities	52,849	52,027
Commitments and Contingencies
Shareholders' 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 – 20,570,710 shares and 20,522,427 shares, respectively;outstanding – 16,135,358 shares and 16,089,832 shares, respectively	2,078	2,057
Capital in excess of par value	189,160	187,405
Accumulated deficit	(40,754)	(47,951)
Accumulated other comprehensive loss	(3,660)	(3,750)
Treasury stock - at cost; 4,435,352 shares and 4,432,595 shares, respectively	21,492	21,484
Total Ultralife Corporation equity	125,332	116,277
Non-controlling interest	95	126
Total shareholders’ equity	125,427	116,403
Total liabilities and shareholders' equity	$ 178,276	$ 168,430

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Trade accounts receivable, allowance for doubtful accounts	$ 300		$ 303
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)		20,783,607	20,570,710
Common stock, shares outstanding (in shares)		16,347,493	16,135,358
Treasury Stock, Common, Shares (in shares)		4,436,114	4,435,352

Consolidated Statements of Loss

Consolidated Statements of Loss and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 158,644	$ 131,840
Cost of products sold	119,444	102,440
Gross profit	39,200	29,400
Operating expenses:
Research and development	7,531	7,081
Selling, general and administrative	22,194	22,190
Total operating expenses	29,725	29,271
Operating income	9,475	129
Other expense (income):
Interest and financing expense	2,016	951
Miscellaneous income	(1,658)	(376)
Total other expense, net	358	575
Loss before income taxes	9,117	(446)
Income tax (benefit) provision	1,951	(326)
Net loss	7,166	(120)
Net (loss) income attributable to non-controlling interest	(31)	(1)
Loss attributable to Ultralife Corporation	7,197	(119)
Other comprehensive (loss) income:
Foreign currency translation adjustments	90	(2,097)
Comprehensive loss attributable to Ultralife Corporation	$ 7,287	$ (2,216)
Net loss per share attributable to Ultralife Corporation common shareholders – Basic (in dollars per share)	$ 0.03	$ 0.05
Net loss per share attributable to Ultralife Corporation common shareholders – Diluted (in dollars per share)	$ 0.03	$ 0.05
Weighted average shares outstanding – Basic (in shares)	16,214	16,125
Weighted average shares outstanding – Diluted (in shares)	16,226	16,125

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2021	20,522,427						16,135,358
Balance at Dec. 31, 2021	$ 2,052	$ 186,518	$ (1,653)	$ (47,832)	$ (21,469)	$ 127	$ 117,743
Net loss				(119)		(1)	$ (120)
Stock option exercises (in shares)	39,119						59,500
Stock option exercises	$ 4	112			(7)		$ 109
Stock-based compensation -stock options		761					761
Stock-based compensation -restricted stock		15					15
Vesting of restricted stock (in shares)	9,164
Vesting of restricted stock	$ 1	(1)			(8)		(8)
Foreign currency translation adjustments			(2,097)				$ (2,097)
Balance (in shares) at Dec. 31, 2022	20,570,710						16,347,493
Balance at Dec. 31, 2022	$ 2,057	187,405	(3,750)	(47,951)	(21,484)	126	$ 116,403
Net loss				7,197		(31)	$ 7,166
Stock option exercises (in shares)	210,397						254,393
Stock option exercises	$ 21	1,227			0		$ 1,248
Stock-based compensation -stock options		522					522
Stock-based compensation -restricted stock		6					6
Vesting of restricted stock (in shares)	2,500
Vesting of restricted stock	$ 0	0			(8)		(8)
Foreign currency translation adjustments			90				90
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

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
OPERATING ACTIVITIES:
Net loss	$ 7,166	$ (120)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	3,022	3,177
Amortization of intangible assets	889	1,282
Amortization of financing fees	64	36
Stock-based compensation	528	776
Deferred income tax expense	1,301	(962)
Changes in operating assets and liabilities:
Accounts receivable	(3,890)	(7,881)
Inventories	(943)	(8,747)
Prepaid expenses and other assets	(3,098)	911
Income taxes receivable and payable	(142)	180
Accounts payable and other liabilities	(2,968)	10,085
Net cash (used in) provided by operating activities	1,929	(1,263)
INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(2,552)	(1,679)
Net cash used in investing activities	(2,552)	(1,679)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings on credit facility	7,250	3,350
Payment of credit facilities	(3,000)	(2,833)
Proceeds from exercise of stock options	1,248	116
Payment of debt issuance costs	0	(100)
Tax withholdings on stock-based awards	(8)	(15)
Net cash provided by financing activities	5,490	518
Effect of exchange rate changes on cash	(302)	(276)
DECREASE IN CASH	4,565	(2,700)
Cash - Beginning of year	5,713	8,413
Cash - End of year	10,278	5,713
Construction in process in accounts payable	347	339
Income taxes paid	769	354
Interest paid	$ 1,961	$ 930

Note 1 - Summary of Operations

Note 1 - Summary of Operations and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
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 USA”), Ultralife Canada Holding Corp (wholly owned by UEHC, “UCHC”) and its wholly owned subsidiary Excell Battery Canada ULC (“Excell Canada,” and collectively “Excell”); 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, 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, 2023 and 2022. e . 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 doubtful accounts 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) As of December 31, 2023, there was deferred revenue on extended warranty contracts of $1,407, comprised of $287 expected to be recognized as revenue within one (1) year and classified as accrued expenses and other current liabilities on our consolidated balance sheet, and $1,120 expected to be recognized as revenue over the remaining duration of the respective contracts and classified as other noncurrent liabilities on our consolidated balance sheet. As of December 31, 2023 and 2022, 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) (3) 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 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, 2023 and 2022, we expended $8,587 and $7,874, respectively, on research and development, including costs of $1,056 and $793, 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 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, 2023 and 2022. 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, 2023, there were 111,247 outstanding stock options and 4,029 unvested restricted stock awards included in the calculation of diluted weighted average shares outstanding, as such securities were dilutive, resulting in 12,661 For the comparable year ended December 31, 2022, there were no potential common shares included in the calculation of diluted weighted average shares outstanding and diluted EPS, as no outstanding securities were dilutive. There were 1,425,693 outstanding stock options and 2,500 unvested restricted stock awards not included in the calculation of diluted EPS for the year ended December 31, 2022, 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 5. 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 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. x. 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 7 for further disclosure regarding lease accounting. y. Recent Accounting Pronouncements Recently Adopted Accounting Guidance In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments”, which requires entities to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost. This guidance was effective for the Company for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2022. The adoption of this new accounting standard did not have a material impact on our consolidated financial statements. Recent Accounting Guidance Not Yet Adopted 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 our annual periods beginning January 1, 2025, with early adoption permitted. We are currently evaluating the potential effect that the updated standard will have on our financial statement disclosures.

Note 2 - Debt

Note 2 - Debt	12 Months Ended
Note 2 - Debt	Dec. 31, 2023
Notes to Financial Statements
Debt Disclosure [Text Block]	Note 2 Debt Credit Facilities On December 13, 2021, Ultralife, Southwest Electronic Energy Corporation, a Texas corporation and wholly owned subsidiary of Ultralife (“SWE”), CLB, INC., a Texas corporation and wholly owned subsidiary of SWE (“CLB”), Ultralife Excell Holding Corp., a Delaware corporation and wholly owned subsidiary of Ultralife (“UEHC”), Ultralife Canada Holding Corp., a Delaware corporation and wholly owned subsidiary of UEHC (“UCHC”), and Excell Battery Corporation USA, a Texas corporation and wholly owned subsidiary of UEHC (“Excell USA”), as borrowers, entered into the Second Amendment Agreement with KeyBank National Association (“KeyBank” or the “Bank”), as lender and administrative agent, to amend the Credit and Security Agreement dated May 31, 2017 as amended by the First Amendment Agreement by and among Ultralife, SWE, CLB and KeyBank dated May 1, 2019 (the “Credit Agreement”). On November 28, 2022, Ultralife, SWE, CLB, UEHC, UCHC, Excell USA, and Excell Battery Canada ULC, a British Columbia unlimited liability corporation and wholly owned subsidiary of UCHC (“Excell Canada”), entered into that certain Third Amendment Agreement with KeyBank, to further amend the Credit Agreement to, among other things, facilitate the joinder of Excell Canada as a guarantor under the Credit Agreement and to replace the LIBOR benchmark thereunder with SOFR (the “Third Amendment Agreement”, and together with the Second Amendment Agreement and the Credit Agreement, the “Amended Credit Agreement”). The Amended Credit Agreement, among other things, provides for a 5-year, $10,000 senior secured term loan (the “Term Loan Facility”) and extends the term of the $30,000 senior secured revolving credit facility (the “Revolving Credit Facility”, and together with the Term Loan Facility, the “Amended Credit Facilities”) through May 30, 2025. Up to six months prior to May 30, 2025, the Revolving Credit Facility may be increased to $50,000 with the Bank’s concurrence. As of December 31, 2023, the Company had $6,167 outstanding principal on the Term Loan Facility, $2,000 of which is included in current portion of long-term debt on the balance sheet, and $19,580 outstanding on the Revolving Credit Facility. As of December 31, 2023, total unamortized debt issuance costs of $123, including placement, renewal and legal fees associated with the Amended Credit Agreement, are classified as a reduction of long-term debt on the balance sheet. Debt issuance costs are amortized to interest expense over the term of the Amended Credit Facilities. The remaining availability under the Revolving Credit Facility is subject to certain borrowing base limits based on trade receivables and inventories. The Company is required to repay the borrowings under the Term Loan Facility in equal consecutive monthly payments commencing on February 1, 2022, in arrears, together with applicable interest. All unpaid principal and accrued and unpaid interest with respect to the Term Loan Facility is due and payable in full on January 1, 2027. All unpaid principal and accrued and unpaid interest with respect to the Revolving Credit Facility is due and payable in full on May 30, 2025. The Company may voluntarily prepay principal amounts outstanding at any time subject to certain restrictions. In addition to the customary affirmative and negative covenants, the Company must maintain a consolidated senior leverage ratio, as defined in the Amended Credit Agreement, of equal to or less than 3.5 to 1.0 for the fiscal quarters ending December 31, 2022 and March 31, 2023, and equal to or less than 3.0 to 1.0 for the fiscal quarters ending June 30, 2023 and thereafter. The Company was in full compliance with its covenants under the Amended Credit Agreement as of December 31, 2023. Borrowings under the Amended Credit Facilities are secured by substantially all the assets of the Company and its subsidiaries. Upon the effectiveness of the Third Amendment Agreement, interest accrues on outstanding indebtedness under the Amended Credit Facilities at the Daily Simple SOFR Rate, plus an index spread adjustment of 0.10%, plus the applicable margin. The applicable margin ranges from 185 to 215 basis points and is determined based on the Company’s senior leverage ratio. The Company must pay a fee of 0.15% to 0.25% based on the average daily unused availability under the Revolving Credit Facility. Payments must be made by the Company to the extent borrowings exceed the maximum amount then permitted to be drawn on the Amended Credit Facilities 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, 2023 are as follows: 2024 $ 2,000 2025 21,580 2026 2,000 2027 167 Thereafter 0 Total $ 25,747

Note 3 - Supplemental Balance S

Note 3 - Supplemental Balance Sheet Information	12 Months Ended
Note 3 - Supplemental Balance Sheet Information	Dec. 31, 2023
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	Note 3 - Supplemental Balance Sheet Information a. Cash and Restricted Cash The Company had cash and restricted cash totaling $10,278 and $5,713 as of December 31, 2023 and 2022, respectively. December 31, 2023 2022 Cash $ 10,196 $ 5,634 Restricted cash 82 79 Total $ 10,278 $ 5,713 As of December 31, 2023 and December 31, 2022, restricted cash included $82 and $79, respectively, of euro-denominated deposits withheld by the Dutch tax authorities and third-party VAT representatives in connection with a previously utilized logistics arrangement in the Netherlands. Restricted cash is included as a component of the cash balance for purposes of the consolidated statements of cash flows. 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, 2023 2022 Raw materials $ 29,098 $ 29,200 Work in process 3,187 2,757 Finished products 9,930 9,235 Total $ 42,215 $ 41,192 c. Property, Plant and Equipment Major classes of property, plant and equipment consisted of the following: December 31, 2023 2022 Land $ 1,273 $ 1,273 Buildings and leasehold improvements 15,998 15,572 Machinery and equipment 57,584 63,981 Furniture and fixtures 2,845 2,845 Computer hardware and software 7,868 7,744 Construction in progress 2,033 1,245 87,601 92,660 Less: Accumulated depreciation (66,484 ) (70,944 ) Total $ 21,117 $ 21,716 Depreciation expense was $3,022 and $3,177 for the years ended December 31, 2023 and 2022, 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, 2023. We identified two no The following table summarizes the goodwill activity by segment for the years ended December 31, 2023 and 2022: Battery & Energy Products Communications Systems Total Balance – January 1, 2023 $ 25,935 $ 11,493 $ 37,428 Effect of foreign currency translation 143 - 143 Balance – December 31, 2023 $ 26,078 $ 11,493 $ 37,571 The composition of intangible assets was: December 31, 2023 Cost Accumulated amortization Net Customer relationships $ 13,092 $ 6,656 $ 6,436 Patents and technology 5,606 5,322 284 Trade names 4,647 647 4,000 Trademarks 3,402 - 3,402 Other 1,500 515 985 Total other intangible assets $ 28,247 $ 13,140 $ 15,107 December 31, 2022 Cost Accumulated amortization Net Customer relationships $ 12,970 $ 5,992 $ 6,978 Patents and technology 5,557 5,171 386 Trade names 4,629 522 4,107 Trademarks 3,404 - 3,404 Other 1,500 454 1,046 Total other intangible assets $ 28,060 $ 12,139 $ 15,921 The change in the cost value of other intangible assets is attributable to the effect of foreign currency translations. Amortization of other intangible assets was included in the following financial statement captions: Year ended December 31, 2023 2022 Research and development expense $ 97 $ 97 Selling, general and administrative expense 792 1,185 Total $ 889 $ 1,282 Future amortization expense of amortizable intangible assets will be approximately $912, $912, $775, $775 and $774 for the five fiscal years ending December 31, 2024 through 2028, respectively.

Note 4 - Commitments and Contin

Note 4 - Commitments and Contingencies	12 Months Ended
Note 4 - Commitments and Contingencies	Dec. 31, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	Note 4 - 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, 2023, we have made commitments to purchase approximately $890 of production machinery and equipment. d. 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 three 2023 2022 Accrued warranty obligations – beginning $ 323 $ 133 Accruals for warranties issued 458 287 Settlements made (234 ) (97 ) Accrued warranty obligations - ending $ 547 $ 323

Note 5 - Stock-based Compensati

Note 5 - Stock-based Compensation	12 Months Ended
Note 5 - Stock-based Compensation	Dec. 31, 2023
Notes to Financial Statements
Shareholders' Equity and Share-Based Payments [Text Block]	Note 5 Stock-Based Compensation We recorded non-cash stock compensation expense in each period as follows: Year ended December 31, 2023 2022 Stock options $ 522 $ 761 Restricted stock 6 15 Total $ 528 $ 776 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. In June 2014, our stockholders approved the 2014 Long-Term Incentive Plan (“2014 LTIP”) as the successor plan to the 2004 Long-Term Incentive Plan (“2004 LTIP”) that expired on June 10, 2014. Under the 2014 LTIP, a total of 1,750,000 shares of common stock were made available for grant of awards. In July 2021, our stockholders approved an amendment to the 2014 LTIP to increase the total number shares of our common stock authorized to be issued pursuant to the 2014 LTIP to 2,750,000. Of the total number of shares of common stock available for awards under the 2014 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 2014 LTIP may be awarded through June 2, 2024. Stock options granted under the 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, 2023, there were 1,250,595 stock options outstanding under the 2014 LTIP. There were no stock options outstanding under the 2004 LTIP. As of December 31, 2023, there was $844 of total unrecognized compensation costs related to outstanding stock options, which we expect to recognize over a weighted average period of 1.5 years. We use the Black-Scholes option-pricing model to estimate fair value of stock-based awards. The following weighted average assumptions were used to value options granted during the years ended December 31, 2023 and 2022: Year ended December 31, 2023 2022 Risk-free interest rate 4.1 % 4.2 % Volatility factor 57 % 50 % Weighted average expected life (years) 4.9 4.8 Forfeiture rate 10.0 % 10.0 % Dividends 0.0 % 0.0 % We used a Monte Carlo simulation option-pricing model to estimate the fair value of market performance stock-based awards, of which there were no new awards for the years ended December 31, 2023 and 2022. We calculate expected volatility for stock options by taking an average of historical volatility over the expected term. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards and vesting schedules. The interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield in effect at the time of grant. Forfeiture rates are calculated by dividing unvested shares forfeited by beginning shares outstanding. The pre-vesting forfeiture rate is calculated yearly and is determined based on historical experience. The following tables summarize data for the stock options issued by us: Year ended December 31, 2023 Number of shares Weighted average exercise price per share Weighted average remaining contractual term Aggregate intrinsic value Shares under option – January 1 1,425,693 $ 6.72 Options granted 231,650 6.69 Options exercised (254,393 ) 5.83 Options forfeited or expired (152,355 ) 5.06 Shares under option – December 31 1,250,595 $ 7.10 3.97 $ 515 Vested and expected to vest - December 31 1,151,228 $ 7.17 3.79 $ 452 Options exercisable – December 31 789,209 $ 7.56 2.69 $ 241 Year ended December 31, 2022 Number of shares Weighted average exercise price per share Shares under option – January 1 1,306,824 $ 6.87 Options granted 289,950 5.42 Options exercised (59,500 ) 3.82 Options forfeited or expired (111,581 ) 6.56 Shares under option – December 31 1,425,693 $ 6.72 Options exercisable – December 31 881,804 $ 7.13 The following table represents additional information about stock options outstanding at December 31, 2023: 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 - $6.36 338,364 4.79 $ 5.42 156,099 $ 5.54 $6.51 - $6.84 353,733 5.54 6.71 134,583 6.51 $6.97 - $8.25 334,165 2.89 7.64 290,355 7.74 $8.45 - $9.96 224,333 1.88 9.44 208,172 9.51 $4.07 - $9.96 1,250,595 3.97 $ 7.10 789,209 $ 7.56 The weighted average fair value of options granted during the years ended December 31, 2023 and 2022 was $3.48 and $2.55, respectively. The total intrinsic value of options (which is the amount by which the stock price exceeded the exercise price of the options on the date of exercise) exercised during the years ended December 31, 2023 and 2022 was $556 and $88, respectively. Cash received from stock option exercises under our stock-based compensation plans for the years ended December 31, 2023 and 2022 was $1,248 and $116, respectively. Restricted shares vest in equal annual installments over three There were 632,593 shares of common stock available for future issuance under equity compensation plans as of December 31, 2023.

Note 6 - Income Taxes

Note 6 - Income Taxes	12 Months Ended
Note 6 - Income Taxes	Dec. 31, 2023
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 6 - Income Taxes For the years ended December 31, 2023 and 2022, we recognized an income tax provision (benefit) of $1,951 and ($326), respectively. Year ended December 31, 2023 2022 Current: State $ 27 $ 19 Foreign 623 617 650 636 Deferred: Federal 1,466 (661 ) Foreign (165 ) (301 ) 1,301 (962 ) Total income tax (benefit) provision $ 1,951 $ (326 ) 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, 2023 2022 Deferred tax assets: Net operating loss carryforwards $ 8,515 $ 11,460 Research and development 3,536 2,812 Tax credit carryforwards 2,898 2,600 Accrued expenses, reserves and other 2,909 2,419 Intangible assets 1,596 1,521 Total deferred tax assets 19,454 20,812 Valuation allowance for deferred tax assets (2,441 ) (2,416 ) Net deferred tax assets 17,013 18,396 Deferred tax liabilities: Intangible assets (8,095 ) (8,176 ) Accrued expenses, reserves and other (65 ) (68 ) Total deferred tax liabilities (8,160 ) (8,244 ) Net deferred tax assets $ 8,853 $ 10,152 Net deferred tax assets (liabilities) are comprised of the following balance sheet amounts: December 31, 2023 2022 Deferred tax assets, net $ 10,567 $ 12,069 Deferred tax liabilities (1,714 ) (1,917 ) $ 8,853 $ 10,152 For financial reporting purposes, net income (loss) from continuing operations before income taxes is as follows: Year ended December 31, 2023 2022 United States $ 7,294 $ (2,771 ) Foreign 1,823 2,325 $ 9,117 $ (446 ) 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: Year ended December 31, 2023 2022 Statutory income tax rate 21 % 21 % Increase (decrease) in tax provision resulting from: Equity compensation 0.4 (29.7 ) Global intangible low-taxed income 1.4 (73.1 ) China R&D deduction (1.0 ) 20.6 Income tax credits (3.3 ) 81.0 Foreign tax rate change - 18.3 Foreign tax rates 1.7 11.5 States taxes 0.8 (3.4 ) Other 0.4 26.9 Effective income tax rate 21.4 % 73.1 % As of December 31, 2023, it was concluded that it is more likely than not that our U.S. deferred tax assets will be fully realized on the basis of 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 expire 2031 thru 2035, and our general business tax credit carryforwards, which expire 2028 thru 2043. As of December 31, 2023, our domestic net operating loss carryforwards and general business tax credits were $27,200 and $2,900, respectively. As of December 31, 2023, for certain past operations in the U.K., we continue to report a valuation allowance for net operating loss carryforwards of approximately $9,800, 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, 2023, we have not There were no As of December 31, 2023, 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 2020 2001 2013

Note 7 - Operating Leases

Note 7 - Operating Leases	12 Months Ended
Note 7 - Operating Leases	Dec. 31, 2023
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	Note 7 Operating Leases The Company has operating leases predominantly for operating facilities. As of December 31, 2023, the remaining lease terms on our operating leases range from approximately one ( 1 The components of lease expense for the current and prior-year comparative periods were as follows: Year ended December 31, 2023 2022 Operating lease cost $ 1,016 $ 894 Variable lease cost 114 95 Total lease cost $ 1,130 $ 989 Supplemental cash flow information related to leases was as follows: Year ended December 31, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,036 $ 908 Right-of-use assets obtained in exchange for lease liabilities: $ 2,192 $ 476 Supplemental balance sheet information related to leases was as follows: December 31, Balance Sheet Classification 2023 2022 Assets: Operating lease right-of-use asset Other noncurrent assets $ 3,589 $ 2,187 Liabilities: Current operating lease liability Accrued expenses and other current liabilities $ 894 $ 895 Operating lease liability, net of current portion Other noncurrent liabilities 2,644 1,307 Total operating lease liability $ 3,538 $ 2,202 Weighted-average remaining lease term (years) 5.3 4.7 Weighted-average discount rate 4.5 % 4.5 % Future minimum lease payments as of December 31, 2023 are as follows: Maturity of Operating Lease Liabilities 2024 $ 894 2025 698 2026 624 2027 644 2028 648 Thereafter 463 Total lease payments $ 3,971 Less: Imputed interest (433 ) Present value of remaining lease payments $ 3,538

Note 8 - 401(k) Retirement Bene

Note 8 - 401(k) Retirement Benefit Plan	12 Months Ended
Note 8 - 401(k) Retirement Benefit Plan	Dec. 31, 2023
Notes to Financial Statements
Retirement Benefits [Text Block]	Note 8 - 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, 2023 and 2022, 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 2023 and 2022, we contributed $678 and $600, respectively, to the 401(k) plan.

Note 9 - Business Segment Infor

Note 9 - Business Segment Information	12 Months Ended
Note 9 - Business Segment Information	Dec. 31, 2023
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	Note 9 - Business Segment Information We report our results in two 2023: Battery & Energy Products Communications Systems Corporate Total Revenue $ 129,953 $ 28,691 $ - $ 158,644 Segment contribution 30,775 8,425 (29,725 ) 9,475 Other expense, net 358 358 Income tax provision 1,951 1,951 Non-controlling interest (31 ) (31 ) Net loss attributable to Ultralife $ 7,197 Total assets $ 124,411 $ 28,873 $ 24,992 $ 178,276 Capital expenditures $ 2,064 $ 118 $ 370 $ 2,552 Goodwill $ 26,078 $ 11,493 $ - $ 37,571 Depreciation and amortization of intangible assets $ 3,336 $ 183 $ 392 $ 3,911 Stock-based compensation $ 336 $ 74 $ 118 $ 528 2022: Battery & Energy Products Communications Systems Corporate Total Revenue $ 119,995 $ 11,845 $ - $ 131,840 Segment contribution 26,154 3,246 (29,271 ) 129 Other expense, net 575 575 Income tax benefit (326 ) (326 ) Non-controlling interest (1 ) (1 ) Net loss attributable to Ultralife $ (119 ) Total assets $ 117,017 $ 29,424 $ 21,989 $ 168,430 Capital expenditures $ 1,371 $ 81 $ 227 $ 1,679 Goodwill $ 25,935 $ 11,493 $ - $ 37,428 Depreciation and amortization of intangible assets $ 3,761 $ 261 $ 437 $ 4,459 Stock-based compensation $ 396 $ 82 $ 298 $ 776 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 $23,709 and $24,405 as of December 31, 2023 and 2022, respectively. The following tables disaggregate our business segment revenues by major source and geography. Commercial and Government/Defense Revenue Information: Year ended December 31, 2023: Total Revenue Commercial Government/ Defense Battery & Energy Products $ 129,953 $ 100,842 $ 29,111 Communications Systems 28,691 - 28,691 Total $ 158,644 $ 100,842 $ 57,802 64 % 36 % Year ended December 31, 2022: Total Revenue Commercial Government/ Defense Battery & Energy Products $ 119,995 $ 93,045 $ 26,950 Communications Systems 11,845 - 11,845 Total $ 131,840 $ 93,045 $ 38,795 71 % 29 % U.S. and Non-U.S. Revenue Information 1 : Year ended December 31, 2023: Total Revenue United States Non-United States Battery & Energy Products $ 129,953 $ 64,120 $ 65,833 Communications Systems 28,691 17,276 11,415 Total $ 158,644 $ 81,396 $ 77,248 51 % 49 % Year ended December 31, 2022: Total Revenue United States Non-United States Battery & Energy Products $ 119,995 $ 58,820 $ 61,175 Communications Systems 11,845 9,094 2,751 Total $ 131,840 $ 67,914 $ 63,926 52 % 48 % 1

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	ITEM 9B. OTHER INFORMATION None.
Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	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, and its majority-owned joint venture Ultralife India. Intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates, Policy [Policy Text Block]	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.
Reclassification, Comparability Adjustment [Policy Text Block]	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, 2023 and 2022.
Cash and Cash Equivalents, Policy [Policy Text Block]	e . 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.
Receivable [Policy Text Block]	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 doubtful accounts 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.
Inventory, Policy [Policy Text Block]	g. Inventories Inventories are stated at the lower of cost or net realizable value with cost determined under the first‑in, first‑out (FIFO) method. We record provisions for excess, obsolete or slow-moving inventory based on changes in customer demand, technology developments or other economic factors.
Property, Plant and Equipment, Policy [Policy Text Block]	h. Property, Plant and Equipment Property, plant and equipment 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.
Goodwill and Intangible Assets, Policy [Policy Text Block]	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.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	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).
Revenue [Policy Text Block]	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) As of December 31, 2023, there was deferred revenue on extended warranty contracts of $1,407, comprised of $287 expected to be recognized as revenue within one (1) year and classified as accrued expenses and other current liabilities on our consolidated balance sheet, and $1,120 expected to be recognized as revenue over the remaining duration of the respective contracts and classified as other noncurrent liabilities on our consolidated balance sheet. As of December 31, 2023 and 2022, 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.
Guarantees, Indemnifications and Warranties Policies [Policy Text Block]	l. Warranty Reserves We typically offer standard warranties against product defects that range from ninety (90) (3)
Shipping and Handling Costs [Policy Text Block]	m. Shipping and Handling Costs Costs incurred by us related to shipping and handling are included in cost of products sold. Amounts charged to customers pertaining to these costs are reflected as revenue.
Sales Commissions [Policy Text Block]	n. Sales Commissions Sales commissions are expensed as incurred for contracts with an expected duration of one year or less. There were no
Research and Development Expense, Policy [Policy Text Block]	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, 2023 and 2022, we expended $8,587 and $7,874, respectively, on research and development, including costs of $1,056 and $793, respectively, on customer sponsored research and development activities, which are included in cost of products sold.
Environmental Cost, Expense Policy [Policy Text Block]	p. Environmental Costs Environmental expenditures that relate to current operations are expensed. Remediation costs that relate to an existing condition caused by past operations are accrued when it is probable that these costs will be incurred and can be reasonably estimated.
Income Tax, Policy [Policy Text Block]	q. Income Taxes 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.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	r. Concentration Related to Customers and Suppliers One
Fair Value Measurement, Policy [Policy Text Block]	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, 2023 and 2022. 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.
Earnings Per Share, Policy [Policy Text Block]	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, 2023, there were 111,247 outstanding stock options and 4,029 unvested restricted stock awards included in the calculation of diluted weighted average shares outstanding, as such securities were dilutive, resulting in 12,661 For the comparable year ended December 31, 2022, there were no potential common shares included in the calculation of diluted weighted average shares outstanding and diluted EPS, as no outstanding securities were dilutive. There were 1,425,693 outstanding stock options and 2,500 unvested restricted stock awards not included in the calculation of diluted EPS for the year ended December 31, 2022, as the effect would be antidilutive.
Share-Based Payment Arrangement [Policy Text Block]	u. Stock-Based Compensation We have various stock-based employee compensation plans that are described more fully in Note 5. 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).
Business Combinations Policy [Policy Text Block]	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.
Lessee, Leases [Policy Text Block]	x. 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 7 for further disclosure regarding lease accounting.
New Accounting Pronouncements, Policy [Policy Text Block]	y. Recent Accounting Pronouncements Recently Adopted Accounting Guidance In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments”, which requires entities to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost. This guidance was effective for the Company for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2022. The adoption of this new accounting standard did not have a material impact on our consolidated financial statements. Recent Accounting Guidance Not Yet Adopted 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 our annual periods beginning January 1, 2025, with early adoption permitted. We are currently evaluating the potential effect that the updated standard will have on our financial statement disclosures.

Note 1 - Summary of Operation_2

Note 1 - Summary of Operations and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
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 2 - Debt (Tables)

Note 2 - Debt (Tables)	12 Months Ended
Note 2 - Debt (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Maturities of Long-Term Debt [Table Text Block]	2024 $ 2,000 2025 21,580 2026 2,000 2027 167 Thereafter 0 Total $ 25,747

Note 3 - Supplemental Balance_2

Note 3 - Supplemental Balance Sheet Information (Tables)	12 Months Ended
Note 3 - Supplemental Balance Sheet Information (Tables)	Dec. 31, 2023
Notes Tables
Cash, Cash Equivalents and Investments [Table Text Block]	December 31, 2023 2022 Cash $ 10,196 $ 5,634 Restricted cash 82 79 Total $ 10,278 $ 5,713
Schedule of Inventory, Current [Table Text Block]	December 31, 2023 2022 Raw materials $ 29,098 $ 29,200 Work in process 3,187 2,757 Finished products 9,930 9,235 Total $ 42,215 $ 41,192
Property, Plant and Equipment [Table Text Block]	December 31, 2023 2022 Land $ 1,273 $ 1,273 Buildings and leasehold improvements 15,998 15,572 Machinery and equipment 57,584 63,981 Furniture and fixtures 2,845 2,845 Computer hardware and software 7,868 7,744 Construction in progress 2,033 1,245 87,601 92,660 Less: Accumulated depreciation (66,484 ) (70,944 ) Total $ 21,117 $ 21,716
Schedule of Goodwill [Table Text Block]	Battery & Energy Products Communications Systems Total Balance – January 1, 2023 $ 25,935 $ 11,493 $ 37,428 Effect of foreign currency translation 143 - 143 Balance – December 31, 2023 $ 26,078 $ 11,493 $ 37,571
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 2023 Cost Accumulated amortization Net Customer relationships $ 13,092 $ 6,656 $ 6,436 Patents and technology 5,606 5,322 284 Trade names 4,647 647 4,000 Trademarks 3,402 - 3,402 Other 1,500 515 985 Total other intangible assets $ 28,247 $ 13,140 $ 15,107 December 31, 2022 Cost Accumulated amortization Net Customer relationships $ 12,970 $ 5,992 $ 6,978 Patents and technology 5,557 5,171 386 Trade names 4,629 522 4,107 Trademarks 3,404 - 3,404 Other 1,500 454 1,046 Total other intangible assets $ 28,060 $ 12,139 $ 15,921
Finite-Lived Intangible Assets Amortization Expense [Table Text Block]	Year ended December 31, 2023 2022 Research and development expense $ 97 $ 97 Selling, general and administrative expense 792 1,185 Total $ 889 $ 1,282

Note 4 - Commitments and Cont_2

Note 4 - Commitments and Contingencies (Tables)	12 Months Ended
Note 4 - Commitments and Contingencies (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Product Warranty Liability [Table Text Block]	2023 2022 Accrued warranty obligations – beginning $ 323 $ 133 Accruals for warranties issued 458 287 Settlements made (234 ) (97 ) Accrued warranty obligations - ending $ 547 $ 323

Note 5 - Stock-based Compensa_2

Note 5 - Stock-based Compensation (Tables)	12 Months Ended
Note 5 - Stock-based Compensation (Tables)	Dec. 31, 2023
Notes Tables
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]	Year ended December 31, 2023 2022 Stock options $ 522 $ 761 Restricted stock 6 15 Total $ 528 $ 776
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year ended December 31, 2023 2022 Risk-free interest rate 4.1 % 4.2 % Volatility factor 57 % 50 % Weighted average expected life (years) 4.9 4.8 Forfeiture rate 10.0 % 10.0 % Dividends 0.0 % 0.0 %
Share-Based Payment Arrangement, Option, Activity [Table Text Block]	Year ended December 31, 2023 Number of shares Weighted average exercise price per share Weighted average remaining contractual term Aggregate intrinsic value Shares under option – January 1 1,425,693 $ 6.72 Options granted 231,650 6.69 Options exercised (254,393 ) 5.83 Options forfeited or expired (152,355 ) 5.06 Shares under option – December 31 1,250,595 $ 7.10 3.97 $ 515 Vested and expected to vest - December 31 1,151,228 $ 7.17 3.79 $ 452 Options exercisable – December 31 789,209 $ 7.56 2.69 $ 241 Year ended December 31, 2022 Number of shares Weighted average exercise price per share Shares under option – January 1 1,306,824 $ 6.87 Options granted 289,950 5.42 Options exercised (59,500 ) 3.82 Options forfeited or expired (111,581 ) 6.56 Shares under option – December 31 1,425,693 $ 6.72 Options exercisable – December 31 881,804 $ 7.13
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 - $6.36 338,364 4.79 $ 5.42 156,099 $ 5.54 $6.51 - $6.84 353,733 5.54 6.71 134,583 6.51 $6.97 - $8.25 334,165 2.89 7.64 290,355 7.74 $8.45 - $9.96 224,333 1.88 9.44 208,172 9.51 $4.07 - $9.96 1,250,595 3.97 $ 7.10 789,209 $ 7.56

Note 6 - Income Taxes (Tables)

Note 6 - Income Taxes (Tables)	12 Months Ended
Note 6 - Income Taxes (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year ended December 31, 2023 2022 Current: State $ 27 $ 19 Foreign 623 617 650 636 Deferred: Federal 1,466 (661 ) Foreign (165 ) (301 ) 1,301 (962 ) Total income tax (benefit) provision $ 1,951 $ (326 )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2023 2022 Deferred tax assets: Net operating loss carryforwards $ 8,515 $ 11,460 Research and development 3,536 2,812 Tax credit carryforwards 2,898 2,600 Accrued expenses, reserves and other 2,909 2,419 Intangible assets 1,596 1,521 Total deferred tax assets 19,454 20,812 Valuation allowance for deferred tax assets (2,441 ) (2,416 ) Net deferred tax assets 17,013 18,396 Deferred tax liabilities: Intangible assets (8,095 ) (8,176 ) Accrued expenses, reserves and other (65 ) (68 ) Total deferred tax liabilities (8,160 ) (8,244 ) Net deferred tax assets $ 8,853 $ 10,152
Schedule of Net Deferred Tax Liabilities [Table Text Block]	December 31, 2023 2022 Deferred tax assets, net $ 10,567 $ 12,069 Deferred tax liabilities (1,714 ) (1,917 ) $ 8,853 $ 10,152
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Year ended December 31, 2023 2022 United States $ 7,294 $ (2,771 ) Foreign 1,823 2,325 $ 9,117 $ (446 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year ended December 31, 2023 2022 Statutory income tax rate 21 % 21 % Increase (decrease) in tax provision resulting from: Equity compensation 0.4 (29.7 ) Global intangible low-taxed income 1.4 (73.1 ) China R&D deduction (1.0 ) 20.6 Income tax credits (3.3 ) 81.0 Foreign tax rate change - 18.3 Foreign tax rates 1.7 11.5 States taxes 0.8 (3.4 ) Other 0.4 26.9 Effective income tax rate 21.4 % 73.1 %

Note 7 - Operating Leases (Tabl

Note 7 - Operating Leases (Tables)	12 Months Ended
Note 7 - Operating Leases (Tables)	Dec. 31, 2023
Notes Tables
Lease, Cost [Table Text Block]	Year ended December 31, 2023 2022 Operating lease cost $ 1,016 $ 894 Variable lease cost 114 95 Total lease cost $ 1,130 $ 989
Lessee, Lease, Cash Flow Information [Table Text Block]	Year ended December 31, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,036 $ 908 Right-of-use assets obtained in exchange for lease liabilities: $ 2,192 $ 476
Lessee, Lease, Balance Sheet Information [Table Text Block]	December 31, Balance Sheet Classification 2023 2022 Assets: Operating lease right-of-use asset Other noncurrent assets $ 3,589 $ 2,187 Liabilities: Current operating lease liability Accrued expenses and other current liabilities $ 894 $ 895 Operating lease liability, net of current portion Other noncurrent liabilities 2,644 1,307 Total operating lease liability $ 3,538 $ 2,202 Weighted-average remaining lease term (years) 5.3 4.7 Weighted-average discount rate 4.5 % 4.5 %
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]	Maturity of Operating Lease Liabilities 2024 $ 894 2025 698 2026 624 2027 644 2028 648 Thereafter 463 Total lease payments $ 3,971 Less: Imputed interest (433 ) Present value of remaining lease payments $ 3,538

Note 9 - Business Segment Inf_2

Note 9 - Business Segment Information (Tables)	12 Months Ended
Note 9 - Business Segment Information (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Battery & Energy Products Communications Systems Corporate Total Revenue $ 129,953 $ 28,691 $ - $ 158,644 Segment contribution 30,775 8,425 (29,725 ) 9,475 Other expense, net 358 358 Income tax provision 1,951 1,951 Non-controlling interest (31 ) (31 ) Net loss attributable to Ultralife $ 7,197 Total assets $ 124,411 $ 28,873 $ 24,992 $ 178,276 Capital expenditures $ 2,064 $ 118 $ 370 $ 2,552 Goodwill $ 26,078 $ 11,493 $ - $ 37,571 Depreciation and amortization of intangible assets $ 3,336 $ 183 $ 392 $ 3,911 Stock-based compensation $ 336 $ 74 $ 118 $ 528 Battery & Energy Products Communications Systems Corporate Total Revenue $ 119,995 $ 11,845 $ - $ 131,840 Segment contribution 26,154 3,246 (29,271 ) 129 Other expense, net 575 575 Income tax benefit (326 ) (326 ) Non-controlling interest (1 ) (1 ) Net loss attributable to Ultralife $ (119 ) Total assets $ 117,017 $ 29,424 $ 21,989 $ 168,430 Capital expenditures $ 1,371 $ 81 $ 227 $ 1,679 Goodwill $ 25,935 $ 11,493 $ - $ 37,428 Depreciation and amortization of intangible assets $ 3,761 $ 261 $ 437 $ 4,459 Stock-based compensation $ 396 $ 82 $ 298 $ 776
Schedule of Revenues from External Customers by Business Segment Sector [Table Text Block]	Total Revenue Commercial Government/ Defense Battery & Energy Products $ 129,953 $ 100,842 $ 29,111 Communications Systems 28,691 - 28,691 Total $ 158,644 $ 100,842 $ 57,802 64 % 36 % Total Revenue Commercial Government/ Defense Battery & Energy Products $ 119,995 $ 93,045 $ 26,950 Communications Systems 11,845 - 11,845 Total $ 131,840 $ 93,045 $ 38,795 71 % 29 % Total Revenue United States Non-United States Battery & Energy Products $ 129,953 $ 64,120 $ 65,833 Communications Systems 28,691 17,276 11,415 Total $ 158,644 $ 81,396 $ 77,248 51 % 49 % Total Revenue United States Non-United States Battery & Energy Products $ 119,995 $ 58,820 $ 61,175 Communications Systems 11,845 9,094 2,751 Total $ 131,840 $ 67,914 $ 63,926 52 % 48 %

Note 1 - Summary of Operation_3

Note 1 - Summary of Operations and Significant Accounting Policies 1 (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Capitalized Contract Cost, Gross	$ 0	$ 0
Research and Development Expense, Gross	8,587	7,874
Customer Funded Research and Development Expense Included in Cost of Goods Sold	$ 1,056	$ 793
Number of Operating Segments	2
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares	111,247	1,425,693
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares	4,029	2,500
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements \| shares	0
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	15%	17%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Large Defense Primary Contractor, 1 [Member] \| Battery & Energy Products Segment [Member]
Concentration Risk, Percentage	18%	19%
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	$ 1,407

Note 1 - Summary of Operation_4

Note 1 - Summary of Operations and Significant Accounting Policies 2 (Details Textual) - Extended Warranty Contracts [Member] $ in Thousands	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 1,407
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Amount	$ 287
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Amount	$ 1,120
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Note 1 - Summary of Operation_5

Note 1 - Summary of Operations and Significant Accounting Policies - Property, Plant and Equipment Estimated Useful Life (Details)	Dec. 31, 2023
Building [Member] \| Minimum [Member]
Buildings (Year)	10 years
Building [Member] \| Maximum [Member]
Buildings (Year)	40 years
Machinery and Equipment [Member] \| Minimum [Member]
Buildings (Year)	5 years
Machinery and Equipment [Member] \| Maximum [Member]
Buildings (Year)	10 years
Furniture and Fixtures [Member] \| Minimum [Member]
Buildings (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Buildings (Year)	10 years
Computer Equipment [Member] \| Minimum [Member]
Buildings (Year)	2 years
Computer Equipment [Member] \| Maximum [Member]
Buildings (Year)	5 years

Note 2 - Debt (Details Textual)

Note 2 - Debt (Details Textual) - Amended Credit Agreement [Member] $ in Thousands	Dec. 13, 2021 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Issuance Costs, Gross		$ 123
Term Loan Facility [Member] \| Long-term Debt, Current Maturities [Member]
Secured Debt, Total		2,000
Revolving Credit Facility [Member]
Secured Debt, Total		6,167
Long-Term Line of Credit, Total		$ 19,580
Maximum Consolidated Senior Leverage Ratio			3	3.5	3.5
Revolving Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.15%
Revolving Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate	0.10%
Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.85%
Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.15%
KeyBank [Member] \| Term Loan Facility [Member]
Debt Instrument, Term	5 years
Debt Instrument, Face Amount	$ 10,000
KeyBank [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	30,000
Line Of Credit Facility Maximum Borrowing Capacity Contingent On Bank Approval	$ 50,000

Note 2 - Debt - Future Minimum

Note 2 - Debt - Future Minimum Principal Repayment Obligations (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 2,000
2025	21,580
2026	2,000
2027	167
Thereafter	0
Total	$ 25,747

Note 3 - Supplemental Balance_3

Note 3 - Supplemental Balance Sheet Information (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 10,278	$ 5,713	$ 8,413
Restricted Cash and Cash Equivalents	82	79
Depreciation	$ 3,022	3,177
Number of Reporting Units	2
Goodwill, Impairment Loss	$ 0
Finite-Lived Intangible Asset, Expected Amortization, Year One	912
Finite-Lived Intangible Asset, Expected Amortization, Year Two	912
Finite-Lived Intangible Asset, Expected Amortization, Year Three	775
Finite-Lived Intangible Asset, Expected Amortization, Year Four	775
Finite-Lived Intangible Asset, Expected Amortization, Year Five	774
NETHERLANDS
Restricted Cash and Cash Equivalents	$ 82	$ 79

Note 3 - Supplemental Balance_4

Note 3 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash	$ 10,196	$ 5,634
Restricted cash	82	79
Total	$ 10,278	$ 5,713	$ 8,413

Note 3 - Supplemental Balance_5

Note 3 - Supplemental Balance Sheet Information - Components of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Raw materials	$ 29,098	$ 29,200
Work in process	3,187	2,757
Finished products	9,930	9,235
Total	$ 42,215	$ 41,192

Note 3 - Supplemental Balance_6

Note 3 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, plant and equipment, gross	$ 87,601	$ 92,660
Less – Accumulated depreciation	(66,484)	(70,944)
Total	21,117	21,716
Land [Member]
Property, plant and equipment, gross	1,273	1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,998	15,572
Machinery and Equipment [Member]
Property, plant and equipment, gross	57,584	63,981
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,845	2,845
Computer Equipment [Member]
Property, plant and equipment, gross	7,868	7,744
Construction in Progress [Member]
Property, plant and equipment, gross	$ 2,033	$ 1,245

Note 3 - Supplemental Balance_7

Note 3 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Balance – January 1, 2022	$ 37,428
Effect of foreign currency translation	143
Balance – December 31, 2022	37,571
Battery & Energy Products Segment [Member]
Balance – January 1, 2022	25,935
Effect of foreign currency translation	143
Balance – December 31, 2022	26,078
Communications Systems Segment [Member]
Balance – January 1, 2022	11,493
Effect of foreign currency translation	0
Balance – December 31, 2022	$ 11,493

Note 3 - Supplemental Balance_8

Note 3 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cost	$ 28,247	$ 28,060
Accumulated amortization	13,140	12,139
Net	15,107	15,921
Customer Relationships [Member]
Cost	13,092	12,970
Accumulated amortization	6,656	5,992
Net	6,436	6,978
Patented Technology [Member]
Cost	5,606	5,557
Accumulated amortization	5,322	5,171
Net	284	386
Trade Names [Member]
Cost	4,647	4,629
Accumulated amortization	647	522
Net	4,000	4,107
Trademarks [Member]
Cost	3,402	3,404
Accumulated amortization	0	0
Net	3,402	3,404
Other Intangible Assets [Member]
Cost	1,500	1,500
Accumulated amortization	515	454
Net	$ 985	$ 1,046

Note 3 - Supplemental Balance_9

Note 3 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Amortization of intangible assets	$ 889	$ 1,282
Research and Development Expense [Member]
Amortization of intangible assets	97	97
Selling, General and Administrative Expenses [Member]
Amortization of intangible assets	$ 792	$ 1,185

Note 4 - Commitments and Cont_3

Note 4 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 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	$ 890

Note 4 - Commitments and Cont_4

Note 4 - Commitments and Contingencies - Changes in Produce Warranty Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accrued warranty obligations – beginning	$ 323	$ 133
Accruals for warranties issued	458	287
Settlements made	(234)	(97)
Accrued warranty obligations - ending	$ 547	$ 323

Note 5 - Stock-based Compensa_3

Note 5 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2021	Jun. 30, 2014
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	1,250,595	1,425,693	1,306,824
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 3.48	$ 2.55
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 556	$ 88
Proceeds from Stock Options Exercised	$ 1,248	$ 116
Common Stock, Capital Shares Reserved for Future Issuance	632,593
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 844
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 6 months
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized	4,029
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number	27
The 2014 Long-term Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized				2,750,000	1,750,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	1,250,595
The 2014 Long-term Incentive Plan [Member] \| Awards Other than Stock Options and SARs [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized					800,000
The 2014 Long-term Incentive Plan [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years

Note 5 - Stock-based Compensa_4

Note 5 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stock options	$ 528	$ 776
Share-Based Payment Arrangement, Option [Member]
Stock options	522	761
Restricted Stock [Member]
Stock options	$ 6	$ 15

Note 5 - Stock-based Compensa_5

Note 5 - Stock-based Compensation - Stock Option Assumptions (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Risk-free interest rate	4.10%	4.20%
Volatility factor	57%	50%
Weighted average expected life (years) (Year)	4 years 10 months 24 days	4 years 9 months 18 days
Forfeiture rate	10%	10%
Dividends	0%	0%

Note 5 - Stock-based Compensa_6

Note 5 - Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Shares under option, beginning of period (in shares)	1,425,693	1,306,824
Options outstanding - weighted average exercise price (in dollars per share)	$ 6.72	$ 6.87
Options granted (in shares)	231,650	289,950
Options granted (in dollars per share)	$ 6.69	$ 5.42
Options exercised (in shares)	(254,393)	(59,500)
Options exercised (in dollars per share)	$ 5.83	$ 3.82
Options forfeited or expired (in shares)	(152,355)	(111,581)
Options forfeited or expired (in dollars per share)	$ 5.06	$ 6.56
Shares under option, end of period (in shares)	1,250,595	1,425,693
Options outstanding - weighted average exercise price (in dollars per share)	$ 7.1	$ 6.72
Options outstanding - weighted average remaining contractual term (Year)	3 years 11 months 19 days
Options exercisable – aggregate intrinsic value (in shares)	789,209	881,804
Options outstanding - aggregate intrinsic value	$ 515
Options exercisable – weighted average exercise price (in dollars per share)	$ 7.56	$ 7.13
Vested and Expected to Vest (in shares)	1,151,228
Options vested and expected to vest - weighted average exercise price (in dollars per share)	$ 7.17
Options vested and expected to vest - weighted average remaining contractual term (Year)	3 years 9 months 14 days
Options vested and expected to vest - aggregate intrinsic value	$ 452
Options exercisable – weighted average remaining contractual term (Year)	2 years 8 months 8 days
Options exercisable - aggregate intrinsic value	$ 241

Note 5 - Share-based Compensati

Note 5 - Share-based Compensation - Options Range of Exercise Prices (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lower range limit (in dollars per share)	$ 4.07
Upper range limit (in dollars per share)	$ 9.96
Options outstanding, number of outstanding options (in shares)	1,250,595
Options outstanding, weighted-average remaining contractual life (Year)	3 years 11 months 19 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 7.1
Options exercisable, number of options exercisable (in shares)	789,209
Options exercisable – weighted average exercise price (in dollars per share)	$ 7.56	$ 7.13
Range One [Member]
Lower range limit (in dollars per share)	4.07
Upper range limit (in dollars per share)	$ 6.36
Options outstanding, number of outstanding options (in shares)	338,364
Options outstanding, weighted-average remaining contractual life (Year)	4 years 9 months 14 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.42
Options exercisable, number of options exercisable (in shares)	156,099
Options exercisable – weighted average exercise price (in dollars per share)	$ 5.54
Range Two [Member]
Lower range limit (in dollars per share)	6.51
Upper range limit (in dollars per share)	$ 6.84
Options outstanding, number of outstanding options (in shares)	353,733
Options outstanding, weighted-average remaining contractual life (Year)	5 years 6 months 14 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 6.71
Options exercisable, number of options exercisable (in shares)	134,583
Options exercisable – weighted average exercise price (in dollars per share)	$ 6.51
Range Three [Member]
Lower range limit (in dollars per share)	6.97
Upper range limit (in dollars per share)	$ 8.25
Options outstanding, number of outstanding options (in shares)	334,165
Options outstanding, weighted-average remaining contractual life (Year)	2 years 10 months 20 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 7.64
Options exercisable, number of options exercisable (in shares)	290,355
Options exercisable – weighted average exercise price (in dollars per share)	$ 7.74
Range Four [Member]
Lower range limit (in dollars per share)	8.45
Upper range limit (in dollars per share)	$ 9.96
Options outstanding, number of outstanding options (in shares)	224,333
Options outstanding, weighted-average remaining contractual life (Year)	1 year 10 months 17 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 9.44
Options exercisable, number of options exercisable (in shares)	208,172
Options exercisable – weighted average exercise price (in dollars per share)	$ 9.51

Note 6 - Income Taxes (Details

Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Expense (Benefit)	$ 1,951	$ (326)
Income Tax Expense (Benefit)	(1,951)	326
Operating Loss Carryforwards	1,300
Deferred Tax Assets, Valuation Allowance	2,441	2,416
Unrecognized Tax Benefits, Ending Balance	0
General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount		$ 2,900
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 27,200
Open Tax Year	2002 2005 2006 2007 2011 2012 2013 2014 2015
Foreign Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance	$ 0
Open Tax Year	2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Foreign Tax Authority [Member] \| Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards	$ 9,800
State and Local Jurisdiction [Member]
Open Tax Year	2002 2005 2006 2007 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021

Note 6 - Income Taxes - Income

Note 6 - Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
State	$ 27	$ 19
Foreign	623	617
Current Income Tax Expense (Benefit)	650	636
Federal	1,466	(661)
Foreign	(165)	(301)
Deferred Income Tax Expense (Benefit)	1,301	(962)
Total income tax (benefit) provision	$ 1,951	$ (326)

Note 6 - Income Taxes - Deferre

Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Net operating loss carryforwards	$ 8,515	$ 11,460
Research and development	3,536	2,812
Tax credit carryforwards	2,898	2,600
Accrued expenses, reserves and other	2,909	2,419
Intangible assets	1,596	1,521
Total deferred tax assets	19,454	20,812
Valuation allowance for deferred tax assets	(2,441)	(2,416)
Net deferred tax assets	17,013	18,396
Intangible assets	(8,095)	(8,176)
Accrued expenses, reserves and other	(65)	(68)
Total deferred tax liabilities	(8,160)	(8,244)
Net deferred tax assets	$ 8,853	$ 10,152

Note 6 - Income Taxes - Net Def

Note 6 - Income Taxes - Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred income taxes, net	$ 10,567	$ 12,069
Deferred tax liabilities	(1,714)	(1,917)
Deferred Tax Assets, Net	$ 8,853	$ 10,152

Note 6 - Income Taxes - United

Note 6 - Income Taxes - United States and Foreign Income (Loss) From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
United States	$ 7,294	$ (2,771)
Foreign	1,823	2,325
Loss before income taxes	$ 9,117	$ (446)

Note 6 - Income Taxes - Effecti

Note 6 - Income Taxes - Effective Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statutory income tax rate	21%	21%
Equity compensation	0.40%	29.70%
Equity compensation	(0.40%)	(29.70%)
Global intangible low-taxed income	1.40%	73.10%
Global intangible low-taxed income	(1.40%)	(73.10%)
China R&D deduction	(1.00%)	(20.60%)
China R&D deduction	1%	20.60%
Income tax credits	(3.30%)	(81.00%)
Income tax credits	3.30%	81%
Foreign tax rate change	0%	18.30%
Foreign tax rates	1.70%	11.50%
States taxes	0.80%	3.40%
States taxes	(0.80%)	(3.40%)
Other	0.40%	26.90%
Effective income tax rate	21.40%	73.10%

Note 7 - Operating Leases (Deta

Note 7 - Operating Leases (Details Textual)	Dec. 31, 2023
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	9 years

Note 7 - Operating Leases - Lea

Note 7 - Operating Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating lease cost	$ 1,016	$ 894
Variable lease cost	114	95
Total lease cost	$ 1,130	$ 989

Note 7 - Operating Leases - Sup

Note 7 - Operating Leases - Supplement Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating cash flows from operating leases	$ 1,036	$ 908
Right-of-use assets obtained in exchange for lease liabilities:	$ 2,192	$ 476

Note 7 - Operating Leases - S_2

Note 7 - Operating Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Weighted-average remaining lease term (years) (Year)	5 years 3 months 18 days	4 years 8 months 12 days
Weighted-average discount rate	4.50%	4.50%
Other Noncurrent Assets [Member]
Operating lease right-of-use asset	$ 3,589	$ 2,187
Accrued Expenses and Other Current Liabilities [Member]
Current operating lease liability	894	895
Other Noncurrent Liabilities [Member]
Operating lease liability, net of current portion	2,644	1,307
Accrued Expenses and Other Current Liabilites and Other Noncurrent Liabilities [Member]
Total operating lease liability	$ 3,538	$ 2,202

Note 7 - Operating Leases - Fut

Note 7 - Operating Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
2024	$ 894
2025	698
2026	624
2027	644
Lessee, Operating Lease, Liability, to be Paid, Year Five	648
Thereafter	463
Total lease payments	3,971
Less: Imputed interest	(433)
Accrued Expenses and Other Current Liabilites and Other Noncurrent Liabilities [Member]
Present value of remaining lease payments	$ 3,538	$ 2,202

Note 8 - 401(k) Retirement Be_2

Note 8 - 401(k) Retirement Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Contribution Plan, Employer Matching Contribution, First 3%, Percent of Match	100%
Defined Contribution Plan, Maximum Employee Contribution Percentage, Subject to Employer Matching Contribution	3%
Defined Contribution Plan, Employer Matching Contribution, Next 2%, Percent of Match	50%
Defined Contribution Plan, Maximum Employee Contribution Percentage, Subject to Employer 50% Matching Contribution	2%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 678	$ 600

Note 9 - Business Segment Inf_3

Note 9 - Business Segment Information (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Number of Operating Segments	2
Non-US [Member]
Long-Lived Assets	$ 23,709	$ 24,405

Note 9 - Business Segment Inf_4

Note 9 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 158,644	$ 131,840
Segment contribution	9,475	129
Other expense, net	358	575
Income tax benefit	1,951	(326)
Non-controlling interest	(31)	(1)
Net loss attributable to Ultralife	7,197	(119)
Total assets	178,276	168,430
Total assets	178,276	168,430
Capital expenditures	2,552	1,679
Goodwill	37,571	37,428
Depreciation and amortization of intangible assets	3,911	4,459
Stock-based compensation	528	776
Battery & Energy Products Segment [Member]
Revenue	129,953	119,995
Segment contribution	30,775	26,154
Total assets	124,411	117,017
Total assets	124,411	117,017
Capital expenditures	2,064	1,371
Goodwill	26,078	25,935
Depreciation and amortization of intangible assets	3,336	3,761
Stock-based compensation	336	396
Communications Systems Segment [Member]
Revenue	28,691	11,845
Segment contribution	8,425	3,246
Total assets	28,873	29,424
Total assets	28,873	29,424
Capital expenditures	118	81
Goodwill	11,493	11,493
Depreciation and amortization of intangible assets	183	261
Stock-based compensation	74	82
Corporate Segment [Member]
Revenue	0	0
Segment contribution	(29,725)	(29,271)
Other expense, net	358	575
Income tax benefit	1,951	(326)
Non-controlling interest	(31)	(1)
Total assets	24,992	21,989
Total assets	24,992	21,989
Capital expenditures	370	227
Goodwill	0	0
Depreciation and amortization of intangible assets	392	437
Stock-based compensation	$ 118	$ 298

Note 9 - Business Segment Inf_5

Note 9 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 158,644	$ 131,840
UNITED STATES
Revenues	$ 81,396	$ 67,914
Revenue, percentage	51%	52%
Non-US [Member]
Revenues	$ 77,248	$ 63,926
Revenue, percentage	49%	48%
Commercial [Member]
Revenues	$ 100,842	$ 93,045
Revenue, percentage	64%	71%
Government & Defense [Member]
Revenues	$ 57,802	$ 38,795
Revenue, percentage	36%	29%
Battery & Energy Products Segment [Member]
Revenues	$ 129,953	$ 119,995
Battery & Energy Products Segment [Member] \| UNITED STATES
Revenues	64,120	58,820
Battery & Energy Products Segment [Member] \| Non-US [Member]
Revenues	65,833	61,175
Battery & Energy Products Segment [Member] \| Commercial [Member]
Revenues	100,842	93,045
Battery & Energy Products Segment [Member] \| Government & Defense [Member]
Revenues	29,111	26,950
Communications Systems Segment [Member]
Revenues	28,691	11,845
Communications Systems Segment [Member] \| UNITED STATES
Revenues	17,276	9,094
Communications Systems Segment [Member] \| Non-US [Member]
Revenues	11,415	2,751
Communications Systems Segment [Member] \| Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] \| Government & Defense [Member]
Revenues	$ 28,691	$ 11,845