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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	[1]	$ 21,761	$ 24,362	$ 74,504	$ 78,736
Commercial [Member]
Revenues		$ 16,579	$ 15,772	$ 46,935	$ 46,746
Revenue, percentage		76.00%	65.00%	63.00%	59.00%
Government & Defense [Member]
Revenues		$ 5,182	$ 8,590	$ 27,569	$ 31,990
Revenue, percentage		24.00%	35.00%	37.00%	41.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 20,008	$ 21,819	$ 64,994	$ 66,616
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues		16,579	15,772	46,935	46,746
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues		3,429	6,047	18,059	19,870
Communications Systems Segment [Member]
Revenues	[1]	1,753	2,543	9,510	12,120
Communications Systems Segment [Member] | Commercial [Member]
Revenues		0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues		$ 1,753	$ 2,543	$ 9,510	$ 12,120
[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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The percentage of total revenue for the period.

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