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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Revenues | $ 47,943 | $ 48,561 | $ 95,388 | $ 99,307
UNITED STATES |  |  |  |
Revenues | $ 28,654 | $ 35,364 | $ 59,905 | $ 74,833
Revenue, percentage | 60.00% | 73.00% | 63.00% | 75.00%
Non-US [Member] |  |  |  |
Revenues | $ 19,289 | $ 13,197 | $ 35,483 | $ 24,474
Revenue, percentage | 40.00% | 27.00% | 37.00% | 25.00%
Commercial [Member] |  |  |  |
Revenues | $ 29,860 | $ 31,333 | $ 60,361 | $ 63,620
Revenue, percentage | 62.00% | 65.00% | 63.00% | 64.00%
Government & Defense [Member] |  |  |  |
Revenues | $ 18,083 | $ 17,228 | $ 35,027 | $ 35,687
Revenue, percentage | 38.00% | 35.00% | 37.00% | 36.00%
Battery & Energy Products Segment [Member] |  |  |  |
Revenues | $ 44,189 | $ 45,867 | $ 88,344 | $ 92,188
Battery & Energy Products Segment [Member] | UNITED STATES |  |  |  |
Revenues | 26,057 | 33,300 | 55,001 | 68,482
Battery & Energy Products Segment [Member] | Non-US [Member] |  |  |  |
Revenues | 18,132 | 12,567 | 33,343 | 23,706
Battery & Energy Products Segment [Member] | Commercial [Member] |  |  |  |
Revenues | 29,860 | 31,333 | 60,361 | 63,620
Battery & Energy Products Segment [Member] | Government & Defense [Member] |  |  |  |
Revenues | 14,329 | 14,534 | 27,983 | 28,568
Communications Systems Segment [Member] |  |  |  |
Revenues | 3,754 | 2,694 | 7,044 | 7,119
Communications Systems Segment [Member] | UNITED STATES |  |  |  |
Revenues | 2,597 | 2,064 | 4,904 | 6,351
Communications Systems Segment [Member] | Non-US [Member] |  |  |  |
Revenues | 1,157 | 630 | 2,140 | 768
Communications Systems Segment [Member] | Commercial [Member] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Communications Systems Segment [Member] | Government & Defense [Member] |  |  |  |
Revenues | $ 3,754 | $ 2,694 | $ 7,044 | $ 7,119

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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 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 2: 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 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: 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 6: 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 7: 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 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-7 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 10: 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 11: 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 12: 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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