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Note 9 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenue $ 158,644 $ 131,840
Segment contribution 9,475 129
Other expense, net 358 575
Income tax benefit 1,951 (326)
Non-controlling interest (31) (1)
Net loss attributable to Ultralife 7,197 (119)
Total assets 178,276 168,430
Total assets 178,276 168,430
Capital expenditures 2,552 1,679
Goodwill 37,571 37,428
Depreciation and amortization of intangible assets 3,911 4,459
Stock-based compensation 528 776
Battery & Energy Products Segment [Member]    
Revenue 129,953 119,995
Segment contribution 30,775 26,154
Total assets 124,411 117,017
Total assets 124,411 117,017
Capital expenditures 2,064 1,371
Goodwill 26,078 25,935
Depreciation and amortization of intangible assets 3,336 3,761
Stock-based compensation 336 396
Communications Systems Segment [Member]    
Revenue 28,691 11,845
Segment contribution 8,425 3,246
Total assets 28,873 29,424
Total assets 28,873 29,424
Capital expenditures 118 81
Goodwill 11,493 11,493
Depreciation and amortization of intangible assets 183 261
Stock-based compensation 74 82
Corporate Segment [Member]    
Revenue 0 0
Segment contribution (29,725) (29,271)
Other expense, net 358 575
Income tax benefit 1,951 (326)
Non-controlling interest (31) (1)
Total assets 24,992 21,989
Total assets 24,992 21,989
Capital expenditures 370 227
Goodwill 0 0
Depreciation and amortization of intangible assets 392 437
Stock-based compensation $ 118 $ 298