Note 10 - Business Segment Information - Revenue by Business Segment Sector (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenues	$ 191,159	$ 164,456
UNITED STATES
Revenues	$ 137,077	$ 97,040
Revenue, percentage	72.00%	59.00%
Non-US [Member]
Revenues	$ 54,082	$ 67,416
Revenue, percentage	28.00%	41.00%
Commercial [Member]
Revenues	$ 125,295	$ 102,082
Revenue, percentage	66.00%	62.00%
Government & Defense [Member]
Revenues	$ 65,864	$ 62,374
Revenue, percentage	34.00%	38.00%
Battery & Energy Products Segment [Member]
Revenues	$ 178,042	$ 144,081
Battery & Energy Products Segment [Member] | UNITED STATES
Revenues	125,903	82,227
Battery & Energy Products Segment [Member] | Non-US [Member]
Revenues	52,139	61,854
Battery & Energy Products Segment [Member] | Commercial [Member]
Revenues	125,295	102,082
Battery & Energy Products Segment [Member] | Government & Defense [Member]
Revenues	52,747	41,999
Communications Systems Segment [Member]
Revenues	13,117	20,375
Communications Systems Segment [Member] | UNITED STATES
Revenues	11,174	14,813
Communications Systems Segment [Member] | Non-US [Member]
Revenues	1,943	5,562
Communications Systems Segment [Member] | Commercial [Member]
Revenues	0	0
Communications Systems Segment [Member] | Government & Defense [Member]
Revenues	$ 13,117	$ 20,375