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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Revenues	[1]	$ 98,267	$ 107,712
Commercial [Member]
Revenues		$ 64,079	$ 62,330
Revenue, percentage		65.00%	58.00%
Government & Defense [Member]
Revenues		$ 34,188	$ 45,382
Revenue, percentage		35.00%	42.00%
Battery & Energy Products Segment [Member]
Revenues	[1]	$ 87,083	$ 91,907
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues		64,079	62,330
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues		23,004	29,577
Communications Systems Segment [Member]
Revenues	[1]	11,184	15,805
Communications Systems Segment [Member] | Commercial [Member]
Revenues		0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues		$ 11,184	$ 15,805
[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
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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