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Note 10 - Business Segment Information (Details) - Components of Segment Performance (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Revenues $ 78,835 $ 101,657
Segment contribution (624) (114)
Miscellaneous (26) (24)
Income taxes-current (94) (539)
Income taxes-deferred (145) (15)
Income Loss from discontinued operations 128 (501)
Noncontrolling interest 34 31
Net income attributable to Ultralife (926) (1,598)
Total assets 90,194 97,718
Stock-based compensation 1,131 1,379
Battery & Energy Products [Member]
    
Segment Reporting Information [Line Items]    
Revenues 57,077 71,084
Segment contribution 14,338 17,562
Total assets 40,851 54,605
Capital expenditures 635 2,812
Depreciation and amortization 2,076 2,471
Stock-based compensation 20 22
Communications Systems [Member]
    
Segment Reporting Information [Line Items]    
Revenues 21,758 30,573
Segment contribution 8,283 11,168
Total assets 30,068 29,586
Capital expenditures 131 320
Depreciation and amortization 127 363
Stock-based compensation 12 13
Corporate Segment [Member]
    
Segment Reporting Information [Line Items]    
Segment contribution (23,245) (28,844)
Interest expense, net (199) (436)
Miscellaneous (26) (24)
Income taxes-current (19) (539)
Income taxes-deferred (220) (15)
Noncontrolling interest 34 31
Total assets 19,275 13,527
Depreciation and amortization 1,156 1,132
Stock-based compensation 1,106 1,352
Total [Member]
    
Segment Reporting Information [Line Items]    
Revenues 78,835 101,657
Segment contribution (624) (114)
Interest expense, net (199) (436)
Miscellaneous (26) (24)
Income taxes-current (19) (539)
Income taxes-deferred (220) (15)
Income Loss from discontinued operations 128 (501)
Noncontrolling interest 34 31
Net income attributable to Ultralife (926) (1,598)
Total assets 90,194 97,718
Capital expenditures 766 3,132
Depreciation and amortization 3,359 3,986
Stock-based compensation 1,131 1,379
Discontinued Operations [Member]
    
Segment Reporting Information [Line Items]    
Income taxes-deferred   174
Income Loss from discontinued operations 128 (501)
Depreciation and amortization   20
Stock-based compensation $ (7) $ (8)