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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Revenues | $ 50,746 | $ 41,927
UNITED STATES |  |
Revenues | $ 39,469 | $ 24,461
Revenue, percentage | 78.00% | 58.00%
Non-US [Member] |  |
Revenues | $ 11,277 | $ 17,466
Revenue, percentage | 22.00% | 42.00%
Commercial [Member] |  |
Revenues | $ 29,659 | $ 24,140
Revenue, percentage | 58.00% | 58.00%
Government & Defense [Member] |  |
Revenues | $ 21,087 | $ 17,787
Revenue, percentage | 42.00% | 42.00%
Battery & Energy Products Segment [Member] |  |
Revenues | $ 46,321 | $ 34,989
Battery & Energy Products Segment [Member] | UNITED STATES |  |
Revenues | 35,182 | 19,603
Battery & Energy Products Segment [Member] | Non-US [Member] |  |
Revenues | 11,139 | 15,386
Battery & Energy Products Segment [Member] | Commercial [Member] |  |
Revenues | 29,659 | 24,140
Battery & Energy Products Segment [Member] | Government & Defense [Member] |  |
Revenues | 16,662 | 10,849
Communications Systems Segment [Member] |  |
Revenues | 4,425 | 6,938
Communications Systems Segment [Member] | UNITED STATES |  |
Revenues | 4,287 | 4,858
Communications Systems Segment [Member] | Non-US [Member] |  |
Revenues | 138 | 2,080
Communications Systems Segment [Member] | Commercial [Member] |  |
Revenues | $ 4,425 | 0
Communications Systems Segment [Member] | Government & Defense [Member] |  |
Revenues |  | $ 6,938

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