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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, 2016 | Dec. 31, 2015
Revenue | $ 82,460 | $ 76,427
Revenue, percentage |  |
UNITED STATES |  |
Revenue | $ 45,094 | $ 46,741
Revenue, percentage | 55.00% | 61.00%
Non-US [Member] |  |
Revenue | $ 37,366 | $ 29,686
Revenue, percentage | 45.00% | 39.00%
Battery & Energy Products Segment [Member] |  |
Revenue | $ 64,753 | $ 65,272
Battery & Energy Products Segment [Member] | UNITED STATES |  |
Revenue | 29,587 | 37,106
Battery & Energy Products Segment [Member] | Non-US [Member] |  |
Revenue | 35,166 | 28,166
Communications Systems Segment [Member] |  |
Revenue | 17,707 | 11,155
Communications Systems Segment [Member] | UNITED STATES |  |
Revenue | 15,507 | 9,635
Communications Systems Segment [Member] | Non-US [Member] |  |
Revenue | $ 2,200 | $ 1,520

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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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