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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Revenues | $ 131,840 | $ 98,267
UNITED STATES |  |
Revenues | $ 67,914 | $ 48,819
Revenue, percentage | 52.00% | 50.00%
Non-US [Member] |  |
Revenues | $ 63,926 | $ 49,448
Revenue, percentage | 48.00% | 50.00%
Commercial [Member] |  |
Revenues | $ 93,045 | $ 63,516
Revenue, percentage | 71.00% | 65.00%
Government & Defense [Member] |  |
Revenues | $ 38,795 | $ 34,751
Revenue, percentage | 29.00% | 35.00%
Battery & Energy Products Segment [Member] |  |
Revenues | $ 119,995 | $ 87,083
Battery & Energy Products Segment [Member] | UNITED STATES |  |
Revenues | 58,820 | 43,298
Battery & Energy Products Segment [Member] | Non-US [Member] |  |
Revenues | 61,175 | 43,785
Battery & Energy Products Segment [Member] | Commercial [Member] |  |
Revenues | 93,045 | 63,516
Battery & Energy Products Segment [Member] | Government & Defense [Member] |  |
Revenues | 26,950 | 23,567
Communications Systems Segment [Member] |  |
Revenues | 11,845 | 11,184
Communications Systems Segment [Member] | UNITED STATES |  |
Revenues | 9,094 | 5,521
Communications Systems Segment [Member] | Non-US [Member] |  |
Revenues | 2,751 | 5,663
Communications Systems Segment [Member] | Commercial [Member] |  |
Revenues | 0 | 0
Communications Systems Segment [Member] | Government & Defense [Member] |  |
Revenues | $ 11,845 | $ 11,184

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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