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Note 10 - Business Segment Information (Detail) - Components of segment performance (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Revenues $ 101,657 $ 135,737
Segment contribution (114) 2,412
Interest expense, net (436) (554)
Miscellaneous (24) 171
Income taxes-current (539) (32)
Income taxes-deferred (15) (448)
Loss from discontinued operations (501) (3,687)
Noncontrolling interest 31 58
Net income attributable to Ultralife (1,598) (2,080)
Total assets 97,718 100,815
Capital expenditures 3,132 2,362
Depreciation and amortization 3,986 4,412
Stock-based compensation 1,379 1,225
Battery & Energy Products [Member]
    
Revenues 71,084 108,203
Segment contribution 17,562 25,169
Total assets 54,605 51,351
Capital expenditures 2,812 1,209
Depreciation and amortization 2,471 2,471
Stock-based compensation 22 70
Communications Systems [Member]
    
Revenues 30,573 27,534
Segment contribution 11,168 9,022
Total assets 29,586 35,382
Capital expenditures 320 1,026
Depreciation and amortization 363 191
Stock-based compensation 13 6
Discontinued Operations [Member]
    
Loss from discontinued operations (501) (3,687)
Total assets   3,473
Depreciation and amortization 20 185
Stock-based compensation (8) 12
Corporate [Member]
    
Segment contribution (28,844) (31,779)
Interest expense, net (436) (554)
Miscellaneous (24) 171
Income taxes-current (539) (32)
Income taxes-deferred (15) (448)
Noncontrolling interest 31 58
Total assets 13,527 10,608
Capital expenditures   127
Depreciation and amortization 1,132 1,565
Stock-based compensation $ 1,352 $ 1,137