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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Revenues [1] $ 29,397 $ 22,864 $ 48,279 $ 45,933
Segment contribution 3,042 1,632 3,590 3,988
Other expense (83) 86 (141) (48)
Tax provision (676) (78) (717) (133)
Non-controlling interest (27) (13) (51) (30)
Net income attributable to Ultralife 2,256 1,627 2,681 3,777
Other income (83) 86 (141) (48)
Other expense (83) 86 (141) (48)
Battery & Energy Products Segment [Member]        
Revenues [1] 20,300 17,831 36,298 35,055
Segment contribution 5,655 4,926 10,065 9,962
Other expense  
Other income  
Other expense  
Communications Systems Segment [Member]        
Revenues [1] 9,097 5,033 11,981 10,878
Segment contribution 3,210 1,624 3,884 3,870
Other expense  
Other income  
Other expense  
Corporate Segment [Member]        
Revenues
Segment contribution (5,823) (4,918) (10,359) (9,844)
Other expense (83) 86 (141) (48)
Tax provision (676) (78) (717) (133)
Non-controlling interest (27) (13) (51) (30)
Other income (83) 86 (141) (48)
Other expense $ (83) $ 86 $ (141) $ (48)
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects