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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 131,840	$ 98,267
UNITED STATES
Revenues	$ 67,914	$ 48,819
Revenue, percentage	52.00%	50.00%
Non-US [Member]
Revenues	$ 63,926	$ 49,448
Revenue, percentage	48.00%	50.00%
Commercial [Member]
Revenues	$ 93,045	$ 63,516
Revenue, percentage	71.00%	65.00%
Government & Defense [Member]
Revenues	$ 38,795	$ 34,751
Revenue, percentage	29.00%	35.00%
Battery & Energy Products Segment [Member]
Revenues	$ 119,995	$ 87,083
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	58,820	43,298
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	61,175	43,785
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	93,045	63,516
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	26,950	23,567
Communications Systems Segment [Member]
Revenues	11,845	11,184
Communications Systems Segment [Member] | UNITED STATES
Revenues	9,094	5,521
Communications Systems Segment [Member] | Non-US [Member]
Revenues	2,751	5,663
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 11,845	$ 11,184

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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