| Document And Entity Information | Feb. 03, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | ULTRALIFE CORPORATION |
| Document, Type | 8-K |
| Document, Period End Date | Feb. 3, 2022 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 000-20852 |
| 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 |
| Trading Symbol | ULBI |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000875657 |
