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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Revenue | $ 85,531 | $ 82,460
Revenue, percentage |  |
UNITED STATES |  |
Revenue | $ 47,614 | $ 45,094
Revenue, percentage | 56.00% | 55.00%
Non-US [Member] |  |
Revenue | $ 37,917 | $ 37,366
Revenue, percentage | 44.00% | 45.00%
Battery & Energy Products Segment [Member] |  |
Revenue | $ 69,789 | $ 64,753
Battery & Energy Products Segment [Member] | UNITED STATES |  |
Revenue | 33,397 | 29,587
Battery & Energy Products Segment [Member] | Non-US [Member] |  |
Revenue | 36,392 | 35,166
Communications Systems Segment [Member] |  |
Revenue | 15,742 | 17,707
Communications Systems Segment [Member] | UNITED STATES |  |
Revenue | 14,217 | 15,507
Communications Systems Segment [Member] | Non-US [Member] |  |
Revenue | $ 1,525 | $ 2,200

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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