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

X

- Definition

The percentage of total revenue for the period.

+ References

No definition available.

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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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