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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Revenue   $ 164,456 $ 158,644
Cost of products sold   (122,142) (119,444)
Gross profit   42,314 39,200
Direct R&D and SG&A expenses   32,349 29,725
Segment contribution   9,965 9,475
Corporate G&A expenses   32,349 29,725
Other expense, net   (1,664) (358)
Income tax provision   (1,892) (1,951)
Non-controlling interest   (97) 31
Net income attributable to Ultralife   6,312 7,197
Total assets $ 220,451 220,451 178,276
Capital expenditures   1,932 2,552
Goodwill 45,006 45,006 37,571
Depreciation and amortization of intangible assets   4,157 3,911
Stock-based compensation   698 528
Battery & Energy Products Segment [Member]      
Goodwill 33,513 33,513 26,078
Communications Systems Segment [Member]      
Goodwill 11,493 11,493 11,493
Operating Segments [Member]      
Direct R&D and SG&A expenses   (22,126) (20,966)
Segment contribution   20,188 18,234
Corporate G&A expenses   (22,126) (20,966)
Operating Segments [Member] | Battery & Energy Products Segment [Member]      
Revenue   144,081 129,953
Cost of products sold   (107,764) (99,178)
Gross profit   36,317 30,775
Direct R&D and SG&A expenses 0 (17,320) (16,499)
Segment contribution   18,997 14,276
Corporate G&A expenses 0 (17,320) (16,499)
Total assets 173,954 173,954 124,411
Capital expenditures   1,261 2,064
Goodwill 33,513 33,513 26,078
Depreciation and amortization of intangible assets   3,676 3,336
Stock-based compensation   383 336
Operating Segments [Member] | Communications Systems Segment [Member]      
Revenue   20,375 28,691
Cost of products sold   (14,378) (20,266)
Gross profit   5,997 8,425
Direct R&D and SG&A expenses 0 (4,806) (4,467)
Segment contribution   1,191 3,958
Corporate G&A expenses 0 (4,806) (4,467)
Total assets 26,876 26,876 28,873
Capital expenditures   513 118
Goodwill 11,493 11,493 11,493
Depreciation and amortization of intangible assets   237 183
Stock-based compensation   96 74
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Revenue   0 0
Cost of products sold   0 0
Gross profit   0 0
Direct R&D and SG&A expenses   (10,223) (8,759)
Corporate G&A expenses   (10,223) (8,759)
Other expense, net   (1,664) (358)
Income tax provision   (1,892) (1,951)
Non-controlling interest   (97) 31
Total assets 19,621 19,621 24,992
Capital expenditures   158 370
Goodwill $ 0 0 0
Depreciation and amortization of intangible assets   244 392
Stock-based compensation   $ 219 $ 118