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Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 42,983	$ 42,692	$ 84,910	$ 74,608
UNITED STATES
Revenues	$ 23,399	$ 21,339	$ 47,860	$ 37,984
Revenue, percentage	54.00%	50.00%	56.00%	51.00%
Non-US [Member]
Revenues	$ 19,584	$ 21,353	$ 37,050	$ 36,624
Revenue, percentage	46.00%	50.00%	44.00%	49.00%
Commercial [Member]
Revenues	$ 27,664	$ 26,950	$ 51,804	$ 49,169
Revenue, percentage	64.00%	63.00%	61.00%	66.00%
Government & Defense [Member]
Revenues	$ 15,319	$ 15,742	$ 33,106	$ 25,439
Revenue, percentage	36.00%	37.00%	39.00%	34.00%
Battery & Energy Products Segment [Member]
Revenues	$ 36,683	$ 33,861	$ 71,672	$ 62,331
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	19,412	17,394	39,015	31,162
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	17,271	16,467	32,657	31,169
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	27,664	26,950	51,804	49,169
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	9,019	6,911	19,868	13,162
Communications Systems Segment [Member]
Revenues	6,300	8,831	13,238	12,277
Communications Systems Segment [Member] | UNITED STATES
Revenues	3,987	3,945	8,845	6,822
Communications Systems Segment [Member] | Non-US [Member]
Revenues	2,313	4,886	4,393	5,455
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 6,300	$ 8,831	$ 13,238	$ 12,277

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+ References

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