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Note 11 Business Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Dec. 31, 2013
Revenues $ 15,285 $ 21,019  
Segment contribution (1,096) 375  
Interest, financing and miscellaneous expense, net (63) (113)  
Tax provision (60) (98)  
Discontinued operations (61) 264  
Noncontrolling interest (6) 6  
Net (loss) income attributable to Ultralife (1,286) 434  
Total assets 88,369 92,242 90,194
Battery and Energy Products
      
Revenues 13,922 13,053  
Segment contribution 3,801 3,100  
Total assets 38,630 47,742  
Communications Systems
      
Revenues 1,363 7,966  
Segment contribution 534 3,279  
Total assets 28,254 32,645  
Discontinued Operations
      
Revenues 0 0  
Segment contribution 0 0  
Discontinued operations 61 (264)  
Total assets 0 0  
Corporate
      
Revenues 0 0  
Segment contribution (5,431) (6,004)  
Interest, financing and miscellaneous expense, net (63) (113)  
Tax provision (60) (98)  
Noncontrolling interest 6 (6)  
Net (loss) income attributable to Ultralife (1,286) 434  
Total assets $ 21,485 $ 11,855