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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenue $ 50,746 $ 41,927
Cost of products sold (38,001) (30,457)
Gross profit 12,745 11,470
Direct SG&A expenses 9,346 7,407
Research and development (2,404) (1,756)
Segment contribution 3,399 4,063
Corporate G&A expenses 9,346 7,407
Other expenses, net (953) (456)
Income tax provision (567) (703)
Non-controlling interest (14) (13)
Net income attributable to Ultralife 1,865 2,891
Operating Segments [Member]    
Direct SG&A expenses (4,231) (3,301)
Segment contribution 6,110 6,413
Corporate G&A expenses (4,231) (3,301)
Operating Segments [Member] | Battery & Energy Products Segment [Member]    
Revenue 46,321 34,989
Cost of products sold (34,881) (26,003)
Gross profit 11,440 8,986
Direct SG&A expenses (3,865) (2,907)
Research and development (1,591) (1,001)
Segment contribution 5,984 5,078
Corporate G&A expenses (3,865) (2,907)
Operating Segments [Member] | Communications Systems Segment [Member]    
Revenue 4,425 6,938
Cost of products sold (3,120) (4,454)
Gross profit 1,305 2,484
Direct SG&A expenses (366) (394)
Research and development (813) (755)
Segment contribution 126 1,335
Corporate G&A expenses (366) (394)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Revenue 0 0
Cost of products sold 0 0
Gross profit 0 0
Direct SG&A expenses (2,711) (2,350)
Research and development 0  
Corporate G&A expenses (2,711) (2,350)
Other expenses, net (953) (456)
Income tax provision (567) (703)
Non-controlling interest $ (14) $ (13)