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Note 10 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenue	[1]	$ 25,973	$ 25,814
UNITED STATES
Revenue	[1]	$ 14,058	$ 15,638
Revenue, percentage	[1]	54.00%	61.00%
Non-US [Member]
Revenue	[1]	$ 11,915	$ 10,176
Revenue, percentage	[1]	46.00%	39.00%
Battery & Energy Products Segment [Member]
Revenue	[1]	$ 22,111	$ 20,761
Battery & Energy Products Segment [Member] | UNITED STATES
Revenue	[1]	12,590	11,284
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenue	[1]	9,521	9,477
Communications Systems Segment [Member]
Revenue	[1]	3,862	5,053
Communications Systems Segment [Member] | UNITED STATES
Revenue	[1]	1,468	4,354
Communications Systems Segment [Member] | Non-US [Member]
Revenue	[1]	$ 2,394	$ 699
[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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