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Note 13 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue $ 76,427 $ 66,494  
Segment contribution 3,330 (1,443)  
Interest expense, net   (205)  
Miscellaneous (65) 154  
Income tax provision (310) (268)  
Income (loss) from discontinued operations 0 (61)  
Noncontrolling interest (29) (15)  
Net income (loss) attributable to Ultralife 2,869 (2,116)  
Total assets 81,522 87,642  
Goodwill 16,283 16,407 $ 16,419
Stock-based compensation 571 1,003  
Corporate      
Revenue 0 0  
Segment contribution (19,986) (20,793)  
Interest expense, net (245) (205)  
Miscellaneous 65 154  
Income tax provision 310 268  
Noncontrolling interest 29 15  
Total assets 17,378 20,171  
Capital expenditures 562 206  
Depreciation and amortization 984 955  
Stock-based compensation 522 971  
DiscontinuedOperations      
Revenue 0 0  
Segment contribution 0 0  
Income (loss) from discontinued operations 0 (61)  
Battery [Member]      
Revenue 65,272 56,772  
Segment contribution 18,698 15,516  
Total assets 35,295 38,415  
Capital expenditures 355 1,400  
Goodwill 4,790 4,914  
Depreciation and amortization 1,625 2,089  
Stock-based compensation 46 28  
Communications Systems      
Revenue 11,155 9,722  
Segment contribution 4,618 3,834  
Total assets 28,849 29,056  
Capital expenditures 973 1,066  
Goodwill 11,493 11,493  
Depreciation and amortization 98 89  
Stock-based compensation $ 3 $ 4