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Note 4 - Goodwill and Intangible Assets - Component of Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Goodwill	$ 21,707	$ 21,605
Electronic Test [Member]
Goodwill	3,436	3,369
Environmental Technologies [Member]
Goodwill	1,817	1,817
Process Technologies [Member]
Goodwill	$ 16,454	$ 16,419

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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