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Note 12 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 25, 2016
Sep. 27, 2015
Sep. 25, 2016
Sep. 27, 2015
Dec. 31, 2015
Battery & Energy Products Segment [Member]          
Revenues $ 14,943 $ 16,390 $ 47,142 $ 48,638  
Segment Contribution 4,522 4,774 14,404 14,100  
Total Assets 42,394 35,828 42,394 35,828  
Communications Systems Segment [Member]          
Revenues 4,688 2,654 13,693 8,538  
Segment Contribution 1,475 1,126 3,898 3,666  
Total Assets 32,129 28,191 32,129 28,191  
Corporate Segment [Member]          
Revenues  
Segment Contribution (4,859) (4,727) (16,183) (14,954)  
Interest, Financing and Miscellaneous Expense, Net (30) 5 (167) (156)  
Tax Provision (92) (130) (213) (312)  
Non-Controlling Interest 3 (1) 25 23  
Total Assets 9,034 17,333 9,034 17,333  
Revenues 19,631 19,044 60,835 57,176  
Segment Contribution 1,138 1,173 2,119 2,812  
Interest, Financing and Miscellaneous Expense, Net (30) 5 (167) (156)  
Tax Provision (92) (130) (213) (312)  
Non-Controlling Interest 3 (1) 25 23  
Net Income Attributable to Ultralife 1,019 1,047 1,764 2,367  
Total Assets $ 83,557 $ 81,352 $ 83,557 $ 81,352 $ 81,522