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Note 12 - Business Segment Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Dec. 31, 2014
Revenue $ 18,955,000 $ 15,199,000 $ 38,132,000 $ 30,484,000  
Segment contribution 817,000 (1,324,000) 1,639,000 (2,420,000)  
Interest, financing and miscellaneous expense, net 28,000 5,000 (160,000) (58,000)  
Income tax provision (71,000) (57,000) (182,000) (117,000)  
Income (loss) from discontinued operations   0 0 (61,000)  
Noncontrolling interest 14,000 16,000 24,000 10,000  
Net loss attributable to Ultralife 788,000 (1,360,000) 1,321,000 (2,646,000)  
Total assets 82,935,000 86,931,000 82,935,000 86,931,000 $ 87,642,000
Battery & Energy Products          
Revenue 15,972,000 12,165,000 32,248,000 26,087,000  
Segment contribution 4,542,000 2,876,000 9,326,000 6,677,000  
Total assets 37,084,000 37,586,000 37,084,000 37,586,000  
Communications Systems          
Revenue 2,983,000 3,034,000 5,884,000 4,397,000  
Segment contribution 1,317,000 1,336,000 2,540,000 1,870,000  
Total assets 27,906,000 29,866,000 27,906,000 29,866,000  
Discontinued Operations          
Revenue 0 0 0 0  
Segment contribution 0 0 0 0  
Income (loss) from discontinued operations 0 0   (61,000)  
Corporate          
Revenue 0   0 0  
Segment contribution (5,042,000) (5,536,000) (10,227,000) (10,967,000)  
Interest, financing and miscellaneous expense, net 28,000 5,000 (160,000) (58,000)  
Income tax provision (71,000) (57,000) (182,000) (117,000)  
Noncontrolling interest     24,000 10,000  
Total assets $ 17,945,000 $ 19,479,000 $ 17,945,000 $ 19,479,000