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Note 9 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue [1] $ 87,190 $ 85,531  
Segment Contribution 6,555 6,476  
Other Income (Expenses) 58 (181)  
Income Tax Benefit (Expenses) 18,386 1,369  
Non-Controlling Interest (69) (16)  
Net Income Attributable to Ultralife 24,930 7,648  
Total Assets 120,104 97,186  
Capital Expenditures 4,185 1,290  
Goodwill 20,109 20,458 $ 19,965
Depreciation and Amortization of Intangible Assets 2,369 2,427  
Stock-Based Compensation 890 653  
Battery & Energy Products Segment [Member]      
Revenue [1] 70,497 69,789  
Segment Contribution 19,574 19,659  
Total Assets 50,511 44,720  
Capital Expenditures 2,948 1,015  
Goodwill 8,616 8,965 8,472
Depreciation and Amortization of Intangible Assets 1,611 1,830  
Stock-Based Compensation 333 301  
Communications Systems Segment [Member]      
Revenue [1] 16,693 15,742  
Segment Contribution 6,009 6,573  
Total Assets 26,875 32,169  
Capital Expenditures 614 212  
Goodwill 11,493 11,493 $ 11,493
Depreciation and Amortization of Intangible Assets 375 430  
Stock-Based Compensation 106 88  
Corporate Segment [Member]      
Revenue    
Segment Contribution (19,028) (19,756)  
Other Income (Expenses) 58 (181)  
Income Tax Benefit (Expenses) 18,386 1,369  
Non-Controlling Interest (69) (16)  
Total Assets 42,718 20,297  
Capital Expenditures 623 63  
Depreciation and Amortization of Intangible Assets 383 167  
Stock-Based Compensation $ 451 $ 264  
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects