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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Revenue | [1] | $ 106,795 | $ 87,190
Revenue, percentage | [1] |  |
Commercial [Member] |  |  |
Revenue |  | $ 59,682 | $ 41,044
Revenue, percentage |  | 56.00% | 47.00%
Government & Defense [Member] |  |  |
Revenue |  | $ 47,113 | $ 46,146
Revenue, percentage |  | 44.00% | 53.00%
Battery & Energy Products Segment [Member] |  |  |
Revenue | [1] | $ 83,996 | $ 70,497
Battery & Energy Products Segment [Member] | Commercial [Member] |  |  |
Revenue |  | 59,682 | 41,044
Battery & Energy Products Segment [Member] | Government & Defense [Member] |  |  |
Revenue |  | 24,314 | 29,453
Communications Systems Segment [Member] |  |  |
Revenue | [1] | 22,799 | 16,693
Communications Systems Segment [Member] | Commercial [Member] |  |  |
Revenue |  |  |
Communications Systems Segment [Member] | Government & Defense [Member] |  |  |
Revenue |  | $ 22,799 | $ 16,693
[1] | Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

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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 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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