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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues [1] $ 21,761 $ 24,362 $ 74,504 $ 78,736
Segment contribution (779) 707 1,264 4,486
Other income 1 (53) (76) (262)
Income tax benefit 175 (192) (290) (1,010)
Non-controlling interest 18 (55) (1) (90)
Net loss attributable to Ultralife (585) 407 897 3,124
Tax provision 175 (192) (290) (1,010)
Battery & Energy Products Segment [Member]        
Revenues [1] 20,008 21,819 64,994 66,616
Segment contribution 4,792 5,677 16,244 17,019
Other income      
Communications Systems Segment [Member]        
Revenues [1] 1,753 2,543 9,510 12,120
Segment contribution 316 834 3,109 4,789
Corporate Segment [Member]        
Revenues 0 0 0 0
Segment contribution (5,887) (5,804) (18,089) (17,322)
Other income 1 (53) (76) (262)
Income tax benefit 175 (192) (290) (1,010)
Non-controlling interest 18 (55) (1) (90)
Tax provision $ 175 $ (192) $ (290) $ (1,010)
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects.