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Note 11 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 48,561	$ 42,983	$ 99,307	$ 84,910
UNITED STATES
Revenues	$ 35,364	$ 23,399	$ 74,833	$ 47,860
Revenue, percentage	73.00%	54.00%	75.00%	56.00%
Non-US [Member]
Revenues	$ 13,197	$ 19,584	$ 24,474	$ 37,050
Revenue, percentage	27.00%	46.00%	25.00%	44.00%
Commercial [Member]
Revenues	$ 31,333	$ 27,664	$ 60,992	$ 51,804
Revenue, percentage	65.00%	64.00%	61.00%	61.00%
Government & Defense [Member]
Revenues	$ 17,228	$ 15,319	$ 38,315	$ 33,106
Revenue, percentage	35.00%	36.00%	39.00%	39.00%
Battery & Energy Products Segment [Member]
Revenues	$ 45,867	$ 36,683	$ 92,188	$ 71,672
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	33,300	19,412	68,482	39,015
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	12,567	17,271	23,706	32,657
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	31,333	27,664	60,992	51,804
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	14,534	9,019	31,196	19,868
Communications Systems Segment [Member]
Revenues	2,694	6,300	7,119	13,238
Communications Systems Segment [Member] | UNITED STATES
Revenues	2,064	3,987	6,351	8,845
Communications Systems Segment [Member] | Non-US [Member]
Revenues	630	2,313	768	4,393
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 2,694	$ 6,300	$ 7,119	$ 13,238

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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