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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue $ 106,795 $ 87,190  
Segment contribution 7,368 6,555  
Other income (expense) 597 (58)  
Income tax provision (benefit) 1,457 (18,386)  
Non-controlling interest 109 69  
Net income attributable to Ultralife 5,205 24,930  
Total assets 144,557 120,848  
Capital expenditures 6,281 4,185  
Goodwill 26,753 20,109 $ 20,458
Depreciation and amortization of intangible assets 2,745 2,369  
Stock-based compensation 753 890  
Battery & Energy Products Segment [Member]      
Revenue 83,996 70,497  
Segment contribution 22,813 19,574  
Total assets 79,413 50,648  
Capital expenditures 5,805 2,948  
Goodwill 15,260 8,616 8,965
Depreciation and amortization of intangible assets 2,104 1,611  
Stock-based compensation 355 333  
Communications Systems Segment [Member]      
Revenue 22,799 16,693  
Segment contribution 8,352 6,009  
Total assets 40,458 27,482  
Capital expenditures 44 614  
Goodwill 11,493 11,493 $ 11,493
Depreciation and amortization of intangible assets 364 375  
Stock-based compensation 119 106  
Corporate Segment [Member]      
Revenue    
Segment contribution (23,797) (19,028)  
Other income (expense) 597 (58)  
Income tax provision (benefit) 1,457 (18,386)  
Non-controlling interest 109 69  
Total assets 24,686 42,718  
Capital expenditures 432 623  
Goodwill    
Depreciation and amortization of intangible assets 277 383  
Stock-based compensation $ 279 $ 451