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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, 2017 | Dec. 31, 2016
Revenue | $ 85,531 | $ 82,460
Revenue, percentage |  |
Commercial [Member] |  |
Revenue | $ 40,790 | $ 40,886
Revenue, percentage | 48.00% | 50.00%
Government & Defense [Member] |  |
Revenue | $ 44,741 | $ 41,574
Revenue, percentage | 52.00% | 50.00%
Battery & Energy Products Segment [Member] |  |
Revenue | $ 69,789 | $ 64,753
Battery & Energy Products Segment [Member] | Commercial [Member] |  |
Revenue | 40,790 | 40,886
Battery & Energy Products Segment [Member] | Government & Defense [Member] |  |
Revenue | 28,999 | 23,867
Communications Systems Segment [Member] |  |
Revenue | 15,742 | 17,707
Communications Systems Segment [Member] | Commercial [Member] |  |
Revenue |  |
Communications Systems Segment [Member] | Government & Defense [Member] |  |
Revenue | $ 15,742 | $ 17,707

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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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