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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenue	[1]	$ 25,973	$ 25,814
Commercial [Member]
Revenue		$ 14,345	$ 14,802
Revenue, percentage		55.00%	57.00%
Government & Defense [Member]
Revenue		$ 11,628	$ 11,012
Revenue, percentage		45.00%	43.00%
Battery & Energy Products Segment [Member]
Revenue	[1]	$ 22,111	$ 20,761
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenue		14,345	14,802
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenue		7,766	5,959
Communications Systems Segment [Member]
Revenue	[1]	3,862	5,053
Communications Systems Segment [Member] | Commercial [Member]
Revenue		0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenue		$ 3,862	$ 5,053
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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