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Note 10 - Business Segment Information - Domestic and International Revenue by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Revenues	[1]	$ 98,267	$ 107,712
UNITED STATES
Revenues	[1]	$ 48,819	$ 62,255
Revenue, percentage	[1]	50.00%	58.00%
Non-US [Member]
Revenues	[1]	$ 49,448	$ 45,457
Revenue, percentage	[1]	50.00%	42.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 87,083	$ 91,907
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	[1]	43,298	49,930
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	[1]	43,785	41,977
Communications Systems Segment [Member]
Revenues	[1]	11,184	15,805
Communications Systems Segment [Member] | UNITED STATES
Revenues	[1]	5,521	12,325
Communications Systems Segment [Member] | Non-US [Member]
Revenues	[1]	$ 5,663	$ 3,480
[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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