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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue $ 85,531 $ 82,460  
Segment Contribution 6,476 3,763  
Interest Expense, Net (183) (263)  
Miscellaneous (2) (80)  
Income Tax Benefit 1,369 (98)  
Non-Controlling Interest (16) 27  
Net Loss Attributable to Ultralife 7,648 3,509  
Total Assets 97,186 84,744  
Capital Expenditures 1,290 1,377  
Goodwill 20,458 19,965 $ 16,283
Depreciation and Amortization of Intangible Assets 2,427 2,726  
Stock-Based Compensation 653 710  
Miscellaneous 2 80  
Battery & Energy Products Segment [Member]      
Revenue 69,789 64,753  
Segment Contribution 19,659 19,580  
Interest Expense, Net  
Miscellaneous  
Income Tax Benefit  
Non-Controlling Interest  
Net Loss Attributable to Ultralife  
Total Assets 44,720 39,691  
Capital Expenditures 1,015 852  
Goodwill 8,965 8,472 4,790
Depreciation and Amortization of Intangible Assets 1,830 2,042  
Stock-Based Compensation 301 403  
Miscellaneous  
Communications Systems Segment [Member]      
Revenue 15,742 17,707  
Segment Contribution 6,573 5,528  
Interest Expense, Net  
Miscellaneous  
Income Tax Benefit  
Non-Controlling Interest  
Net Loss Attributable to Ultralife  
Total Assets 32,169 32,021  
Capital Expenditures 212 158  
Goodwill 11,493 11,493 $ 11,493
Depreciation and Amortization of Intangible Assets 430 541  
Stock-Based Compensation 88 110  
Miscellaneous  
Corporate Segment [Member]      
Revenue  
Segment Contribution (19,756) (21,345)  
Interest Expense, Net (183) (263)  
Miscellaneous (2) (80)  
Income Tax Benefit 1,369 (98)  
Non-Controlling Interest (16) 27  
Net Loss Attributable to Ultralife  
Total Assets 20,297 13,032  
Capital Expenditures 63 367  
Goodwill  
Depreciation and Amortization of Intangible Assets 167 143  
Stock-Based Compensation 264 197  
Miscellaneous $ 2 $ 80