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Note 12 - Business Segment Information - Segment Activity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenues $ 20,833 $ 19,177  
Segment contribution 482 822  
Interest, financing and miscellaneous expense, net (113) (188)  
Tax provision (88) (111)  
Non-Controlling interest 18 10  
Net income attributable to Ultralife 299 533  
Total assets 85,643 89,055 $ 81,522
Corporate Segment [Member]      
Segment Reporting Information [Line Items]      
Segment contribution (5,924) (5,185)  
Interest, financing and miscellaneous expense, net (113) (188)  
Tax provision (88) (111)  
Non-Controlling interest 18 10  
Total assets 5,025 22,694  
Battery & Energy Products      
Segment Reporting Information [Line Items]      
Revenues 16,440 16,276  
Segment contribution 5,217 4,784  
Total assets 46,897 37,299  
Communications Systems      
Segment Reporting Information [Line Items]      
Revenues 4,393 2,901  
Segment contribution 1,188 1,223  
Total assets $ 33,720 $ 29,062