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Note 9 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Revenues, Total | [1] | $ 87,190 | $ 85,531
Revenue, percentage | [1] |  |
UNITED STATES |  |  |
Revenues, Total | [1] | $ 53,054 | $ 47,614
Revenue, percentage | [1] | 61.00% | 56.00%
Non-US [Member] |  |  |
Revenues, Total | [1] | $ 34,136 | $ 37,917
Revenue, percentage | [1] | 39.00% | 44.00%
Battery & Energy Products Segment [Member] |  |  |
Revenues, Total | [1] | $ 70,497 | $ 69,789
Battery & Energy Products Segment [Member] | UNITED STATES |  |  |
Revenues, Total | [1] | 37,898 | 33,397
Battery & Energy Products Segment [Member] | Non-US [Member] |  |  |
Revenues, Total | [1] | 32,599 | 36,392
Communications Systems Segment [Member] |  |  |
Revenues, Total | [1] | 16,693 | 15,742
Communications Systems Segment [Member] | UNITED STATES |  |  |
Revenues, Total | [1] | 15,156 | 14,217
Communications Systems Segment [Member] | Non-US [Member] |  |  |
Revenues, Total | [1] | $ 1,537 | $ 1,525
[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 of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&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 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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