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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Revenues | $ 47,943 | $ 48,561 | $ 95,388 | $ 99,307 |
Cost of products sold | (34,077) | (36,960) | (71,412) | (74,961) |
Gross profit | 13,866 | 11,601 | 23,976 | 24,346 |
Operating Expenses | 10,429 | 9,345 | 20,754 | 18,691 |
Research and development | (3,225) | (2,318) | (6,186) | (4,722) |
Segment contribution | 3,437 | 2,256 | 3,222 | 5,655 |
Operating Income | 3,437 | 2,256 | 3,222 | 5,655 |
Other expenses, net | (451) | (1,143) | (899) | (2,096) |
Income tax provision | (468) | (243) | (276) | (810) |
Non-controlling interest | 25 | 9 | 45 | (5) |
Net income attributable to Ultralife | 2,543 | 879 | 2,092 | 2,744 |
Total assets | 216,157 | 220,961 | 216,157 | 220,961 | $ 216,912
Depreciation and amortization of intangible assets | 1,324 | 1,418 | 2,645 | 2,773 |
Battery & Energy Products Segment [Member] |  |  |  |  |
Operating Expenses | (4,705) |  | (9,165) |  |
Operating Segments [Member] |  |  |  |  |
Operating Expenses |  | (4,408) |  | (8,639) |
Segment contribution | 5,936 | 4,875 | 8,625 | 10,985 |
Operating Income | 5,936 | 4,875 | 8,625 | 10,985 |
Operating Segments [Member] | Battery & Energy Products Segment [Member] |  |  |  |  |
Revenues | 44,189 | 45,867 | 88,344 | 92,188 |
Cost of products sold | (31,686) | (35,032) | (66,483) | (69,913) |
Gross profit | 12,503 | 10,835 | 21,861 | 22,275 |
Operating Expenses | (4,387) | (4,024) | (8,468) | (7,889) |
Research and development | (2,303) | (1,494) | (4,525) | (3,085) |
Segment contribution | 5,813 | 5,317 | 8,868 | 11,301 |
Operating Income | 5,813 | 5,317 | 8,868 | 11,301 |
Total assets | 169,060 | 170,705 | 169,060 | 170,705 |
Depreciation and amortization of intangible assets | 1,161 | 1,321 | 2,383 | 2,586 |
Operating Segments [Member] | Communications Systems Segment [Member] |  |  |  |  |
Revenues | 3,754 | 2,694 | 7,044 | 7,119 |
Cost of products sold | (2,391) | (1,928) | (4,929) | (5,048) |
Gross profit | 1,363 | 766 | 2,115 | 2,071 |
Operating Expenses | (318) | (384) | (697) | (750) |
Research and development | (922) | (824) | (1,661) | (1,637) |
Segment contribution | 123 | (442) | (243) | (316) |
Operating Income | 123 | (442) | (243) | (316) |
Total assets | 26,969 | 28,330 | 26,969 | 28,330 |
Depreciation and amortization of intangible assets | 49 | 58 | 106 | 116 |
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
Cost of products sold | 0 | 0 | 0 | 0 |
Gross profit | 0 | 0 | 0 | 0 |
Research and development | 0 | 0 | 0 | 0 |
Other expenses, net | (451) | (1,143) | (899) | (2,096) |
Income tax provision | (468) | (243) | (276) | (810) |
Non-controlling interest | 25 | 9 | 45 | (5) |
Total assets | 20,128 | 21,926 | 20,128 | 21,926 |
Depreciation and amortization of intangible assets | $ 114 | $ 39 | $ 156 | $ 71 |

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