Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 33,234	$ 21,761	$ 95,733	$ 74,504
Commercial [Member]
Revenues	$ 22,878	$ 16,579	$ 70,154	$ 46,935
Revenue, percentage	69.00%	76.00%	73.00%	63.00%
Government & Defense [Member]
Revenues	$ 10,356	$ 5,182	$ 25,579	$ 27,569
Revenue, percentage	31.00%	24.00%	27.00%	37.00%
Battery & Energy Products Segment [Member]
Revenues	$ 28,583	$ 20,008	$ 87,873	$ 64,994
Battery & Energy Products Segment [Member] \| Commercial [Member]
Revenues	22,878	16,579	70,154	46,935
Battery & Energy Products Segment [Member] \| Government & Defense [Member]
Revenues	5,705	3,429	17,719	18,059
Communications Systems Segment [Member]
Revenues	4,651	1,753	7,860	9,510
Communications Systems Segment [Member] \| Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] \| Government & Defense [Member]
Revenues	$ 4,651	$ 1,753	$ 7,860	$ 9,510

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
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+ Details