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Note 7 - Goodwill and Intangible Assets - Component of Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Goodwill	$ 21,720	$ 21,448
Electronic Test [Member]
Goodwill	3,521	3,055
Environmental Technologies [Member]
Goodwill	1,817	1,817
Process Technologies [Member]
Goodwill	$ 16,382	$ 16,576

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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