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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues	$ 43,371	$ 35,694	$ 142,678	$ 120,604
UNITED STATES
Revenues	$ 31,974	$ 20,878	$ 106,807	$ 68,738
Revenue, percentage	74.00%	58.00%	75.00%	57.00%
Non-US [Member]
Revenues	$ 11,397	$ 14,816	$ 35,871	$ 51,866
Revenue, percentage	26.00%	42.00%	25.00%	43.00%
Commercial [Member]
Revenues	$ 28,026	$ 22,516	$ 89,018	$ 74,320
Revenue, percentage	65.00%	63.00%	62.00%	62.00%
Government & Defense [Member]
Revenues	$ 15,345	$ 13,178	$ 53,660	$ 46,284
Revenue, percentage	35.00%	37.00%	38.00%	38.00%
Battery & Energy Products Segment [Member]
Revenues	$ 39,946	$ 32,529	$ 132,134	$ 104,201
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	28,724	18,311	97,206	57,326
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	11,222	14,218	34,928	46,875
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	28,026	22,516	89,018	74,320
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	11,920	10,013	43,116	29,881
Communications Systems Segment [Member]
Revenues	3,425	3,165	10,544	16,403
Communications Systems Segment [Member] | UNITED STATES
Revenues	3,250	2,567	9,601	11,412
Communications Systems Segment [Member] | Non-US [Member]
Revenues	175	598	943	4,991
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 3,425	$ 3,165	$ 10,544	$ 16,403

X

- Definition

The percentage of total revenue for the period.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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