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Note 5 - Supplemental Balance Sheet Information - Summary of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill balance	$ 38,068
Measurement period adjustment (1)	(30)
Effect of foreign currency translation	(536)
Goodwill balance	37,502
Battery & Energy Products Segment [Member]
Goodwill balance	26,575
Measurement period adjustment (1)	(30)
Effect of foreign currency translation	(536)
Goodwill balance	26,009
Communications Systems Segment [Member]
Goodwill balance	11,493
Measurement period adjustment (1)	0
Effect of foreign currency translation	0
Goodwill balance	$ 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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