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Note 6 - Goodwill and Intangible Assets - Component of Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill $ 21,605 $ 21,448 $ 13,738
Electronic Test [Member]      
Goodwill 3,369 3,055  
Environmental Technologies [Member]      
Goodwill 1,817 1,817  
Process Technologies [Member]      
Goodwill $ 16,419 $ 16,576