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Note 5 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Balance	$ 45,006
Effect of foreign currency translation	135
Balance – March 31, 2024	45,141
Battery & Energy Products Segment [Member]
Balance	33,513
Effect of foreign currency translation	135
Balance – March 31, 2024	33,648
Communications Systems Segment [Member]
Balance	11,493
Effect of foreign currency translation	0
Balance – March 31, 2024	$ 11,493

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