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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

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