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Note 3 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Balance – January 1, 2022	$ 37,428
Effect of foreign currency translation	143
Balance – December 31, 2022	37,571
Battery & Energy Products Segment [Member]
Balance – January 1, 2022	25,935
Effect of foreign currency translation	143
Balance – December 31, 2022	26,078
Communications Systems Segment [Member]
Balance – January 1, 2022	11,493
Effect of foreign currency translation	0
Balance – December 31, 2022	$ 11,493

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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