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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenue $ 131,840 $ 98,267
Segment contribution 129 35
Other expense, net 575 186
Income tax benefit (326) 79
Non-controlling interest (1) 4
Net loss attributable to Ultralife (119) (234)
Total assets 168,430 159,538
Total assets 168,430 159,538
Capital expenditures 1,679 2,814
Goodwill 37,428 38,068
Depreciation and amortization of intangible assets 4,459 3,539
Stock-based compensation 776 671
Battery & Energy Products Segment [Member]    
Revenue 119,995 87,083
Segment contribution 26,154 21,063
Total assets 117,017 110,633
Total assets 117,017 110,633
Capital expenditures 1,371 2,104
Goodwill 25,935 26,575
Depreciation and amortization of intangible assets 3,761 2,847
Stock-based compensation 396 298
Communications Systems Segment [Member]    
Revenue 11,845 11,184
Segment contribution 3,246 3,579
Total assets 29,424 25,359
Total assets 29,424 25,359
Capital expenditures 81 255
Goodwill 11,493 11,493
Depreciation and amortization of intangible assets 261 326
Stock-based compensation 82 125
Corporate Segment [Member]    
Revenue 0 0
Segment contribution (29,271) (24,607)
Other expense, net 575 186
Income tax benefit (326) 79
Non-controlling interest (1) 4
Total assets 21,989 23,546
Total assets 21,989 23,546
Capital expenditures 227 455
Goodwill 0 0
Depreciation and amortization of intangible assets 437 366
Stock-based compensation $ 298 $ 248