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Note 11 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

+ Details

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X

- 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

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