Note 5 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Balance	$ 45,006
Effect of foreign currency translation	370
Balance	45,376
Battery & Energy Products Segment [Member]
Balance	33,513
Effect of foreign currency translation	370
Balance	33,883
Communications Systems Segment [Member]
Balance	11,493
Effect of foreign currency translation	0
Balance	$ 11,493