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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenues	$ 164,456	$ 158,644
UNITED STATES
Revenues	$ 97,040	$ 81,396
Revenue, percentage	59.00%	51.00%
Non-US [Member]
Revenues	$ 67,416	$ 77,248
Revenue, percentage	41.00%	49.00%
Commercial [Member]
Revenues	$ 102,082	$ 100,842
Revenue, percentage	62.00%	64.00%
Government & Defense [Member]
Revenues	$ 62,374	$ 57,802
Revenue, percentage	38.00%	36.00%
Battery & Energy Products Segment [Member]
Revenues	$ 144,081	$ 129,953
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	82,227	64,120
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	61,854	65,833
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	102,082	100,842
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	41,999	29,111
Communications Systems Segment [Member]
Revenues	20,375	28,691
Communications Systems Segment [Member] | UNITED STATES
Revenues	14,813	17,276
Communications Systems Segment [Member] | Non-US [Member]
Revenues	5,562	11,415
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 20,375	$ 28,691

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