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Note 4 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Balance	$ 37,571
Effect of foreign currency translation	221
Balance – March 31, 2024	37,792
Battery & Energy Products Segment [Member]
Balance	26,078
Effect of foreign currency translation	221
Balance – March 31, 2024	26,299
Communications Systems Segment [Member]
Balance	11,493
Effect of foreign currency translation	0
Balance – March 31, 2024	$ 11,493

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