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Note 10 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	[1]	$ 26,770	$ 28,560	$ 52,743	$ 54,374
UNITED STATES
Revenues	[1]	$ 13,766	$ 18,419	$ 27,824	$ 34,056
Revenue, percentage	[1]	51.00%	64.00%	53.00%	63.00%
Non-US [Member]
Revenues	[1]	$ 13,004	$ 10,141	$ 24,919	$ 20,318
Revenue, percentage	[1]	49.00%	36.00%	47.00%	37.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 22,875	$ 24,036	$ 44,986	$ 44,797
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	[1]	11,813	14,195	24,403	25,479
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	[1]	11,062	9,841	20,583	19,318
Communications Systems Segment [Member]
Revenues	[1]	3,895	4,524	7,757	9,577
Communications Systems Segment [Member] | UNITED STATES
Revenues	[1]	1,953	4,224	3,421	8,577
Communications Systems Segment [Member] | Non-US [Member]
Revenues	[1]	$ 1,942	$ 300	$ 4,336	$ 1,000
[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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