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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Apr. 24, 2023
Jun. 30, 2022
Document Information [Line Items]      
Entity, Registrant Name ULTRALIFE CORPORATION    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2022    
Document, Transition Report false    
Entity, File Number 0-20852    
Entity, Incorporation, State or Country Code DE    
Entity, Address, Address Line One 2000 Technology Parkway    
Entity, Address, City or Town Newark    
Entity, Address, State or Province NY    
Entity, Address, Postal Zip Code 14513    
Entity, Tax Identification Number 16-1387013    
City Area Code 315    
Local Phone Number 332-7100    
Title of 12(b) Security Common Stock, $0.10 par value per share    
Trading Symbol ULBI    
Security Exchange Name NASDAQ    
Entity, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
Entity, Current Reporting Status Yes    
Entity, Interactive Data, Current Yes    
Entity, Filer Category Non-accelerated Filer    
Entity, Small Business true    
Entity, Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity, Shell Company false    
Entity, Public Float     $ 44,418,638
Entity, Common Stock Shares, Outstanding   16,135,358  
Amendment Description This Amendment No. 1 to the Annual Report on Form 10-K of Ultralife Corporation (the “Company”) for the year ended December 31, 2022 as originally filed with the Securities and Exchange Commission on March 31, 2023 (the “Original Form 10-K”) is being filed solely to include the information required by Items 10 through 14 of Part III and to amend Item 15 of Part IV and the Index of Exhibits of Form 10-K. This information from Part III of Form 10-K was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in the Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are including this Part III information in this Amendment No. 1 to our Form 10-K because we will not file a definitive proxy statement containing such information within 120 days after the end of the fiscal year covered by the Original Form 10-K. We plan on filing our definitive proxy statement on or about May 30, 2023 as we are holding our 2023 Annual Stockholders’ Meeting (the “Meeting”) on July 19, 2023.   In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (“the Exchange Act”), Part III, Items 10 through 14, and Part IV, Item 15 of the Original Form 10-K are hereby amended and restated in their entirety. The reference on the cover of the Original Form 10-K to the incorporation by reference to portions of our definitive proxy statement into Part III of the Original Form 10-K is hereby deleted. Pursuant to Rule 12b-15 under the Exchange Act, this Amendment No. 1 contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto.   Except as set forth in the first paragraph of this Explanatory Note, this Amendment No. 1 does not amend, modify, or otherwise update any other information in or on exhibits filed with the Original Form 10-K. Accordingly, this Amendment No.1 should be read in conjunction with the Original Form 10-K. In addition, this Amendment No. 1 does not reflect events that may have occurred subsequent to the filing date of the Original Form 10-K.   Unless expressly indicated or the context requires otherwise, the terms “Company,” “we,” “our,” and “us” in this document refer to Ultralife Corporation (“Ultralife”), a Delaware corporation, and, where appropriate, its subsidiaries.    
Auditor Name Freed Maxick CPAs, P.C.    
Auditor Location Rochester, New York    
Auditor Firm ID 317    
Amendment Flag true    
Entity, Central Index Key 0000875657