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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues	$ 35,694	$ 39,488	$ 120,604	$ 114,096
UNITED STATES
Revenues	$ 20,878	$ 20,274	$ 68,738	$ 58,258
Revenue, percentage	58.00%	51.00%	57.00%	51.00%
Non-US [Member]
Revenues	$ 14,816	$ 19,214	$ 51,866	$ 55,838
Revenue, percentage	42.00%	49.00%	43.00%	49.00%
Commercial [Member]
Revenues	$ 22,516	$ 24,150	$ 74,320	$ 73,319
Revenue, percentage	63.00%	61.00%	62.00%	64.00%
Government & Defense [Member]
Revenues	$ 13,178	$ 15,338	$ 46,284	$ 40,777
Revenue, percentage	37.00%	39.00%	38.00%	36.00%
Battery & Energy Products Segment [Member]
Revenues	$ 32,529	$ 31,919	$ 104,201	$ 94,250
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	18,311	15,926	57,326	47,088
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	14,218	15,993	46,875	47,162
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	22,516	24,150	74,320	73,319
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	10,013	7,769	29,881	20,931
Communications Systems Segment [Member]
Revenues	3,165	7,569	16,403	19,846
Communications Systems Segment [Member] | UNITED STATES
Revenues	2,567	4,348	11,412	11,170
Communications Systems Segment [Member] | Non-US [Member]
Revenues	598	3,221	4,991	8,676
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 3,165	$ 7,569	$ 16,403	$ 19,846

X

- Definition

The percentage of total revenue for the period.

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+ References

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-Topic 280
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