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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue $ 98,267 $ 107,712
Segment contribution 35 5,701
Other income (expense) 186 (1,322)
Income tax provision (benefit) 79 1,692
Non-controlling interest 4 99
Net loss attributable to Ultralife (234) 5,232
Total assets 159,538 137,701
Capital expenditures 2,814 3,101
Goodwill 38,068 27,018
Depreciation and amortization of intangible assets 3,539 2,935
Stock-based compensation 671 943
Battery & Energy Products Segment [Member]    
Revenue 87,083 91,907
Segment contribution 21,063 23,400
Other income (expense)
Total assets 110,633 85,112
Capital expenditures 2,104 3,031
Goodwill 26,575 15,525
Depreciation and amortization of intangible assets 2,847 2,269
Stock-based compensation 298 446
Communications Systems Segment [Member]    
Revenue 11,184 15,805
Segment contribution 3,579 5,759
Other income (expense)
Total assets 25,359 26,425
Capital expenditures 255 0
Goodwill 11,493 11,493
Depreciation and amortization of intangible assets 326 342
Stock-based compensation 125 155
Corporate Segment [Member]    
Revenue 0 0
Segment contribution (24,607) (23,458)
Other income (expense) 186 (1,322)
Income tax provision (benefit) 79 1,692
Non-controlling interest 4 99
Total assets 23,546 26,164
Capital expenditures 455 70
Goodwill 0 0
Depreciation and amortization of intangible assets 366 324
Stock-based compensation $ 248 $ 342