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Note 9 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Revenues | $ 158,644 | $ 131,840
UNITED STATES |  |
Revenues | $ 81,396 | $ 67,914
Revenue, percentage | 51.00% | 52.00%
Non-US [Member] |  |
Revenues | $ 77,248 | $ 63,926
Revenue, percentage | 49.00% | 48.00%
Commercial [Member] |  |
Revenues | $ 100,842 | $ 93,045
Revenue, percentage | 64.00% | 71.00%
Government & Defense [Member] |  |
Revenues | $ 57,802 | $ 38,795
Revenue, percentage | 36.00% | 29.00%
Battery & Energy Products Segment [Member] |  |
Revenues | $ 129,953 | $ 119,995
Battery & Energy Products Segment [Member] | UNITED STATES |  |
Revenues | 64,120 | 58,820
Battery & Energy Products Segment [Member] | Non-US [Member] |  |
Revenues | 65,833 | 61,175
Battery & Energy Products Segment [Member] | Commercial [Member] |  |
Revenues | 100,842 | 93,045
Battery & Energy Products Segment [Member] | Government & Defense [Member] |  |
Revenues | 29,111 | 26,950
Communications Systems Segment [Member] |  |
Revenues | 28,691 | 11,845
Communications Systems Segment [Member] | UNITED STATES |  |
Revenues | 17,276 | 9,094
Communications Systems Segment [Member] | Non-US [Member] |  |
Revenues | 11,415 | 2,751
Communications Systems Segment [Member] | Commercial [Member] |  |
Revenues | 0 | 0
Communications Systems Segment [Member] | Government & Defense [Member] |  |
Revenues | $ 28,691 | $ 11,845

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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