Note 14 - Segment Information - Identifiable Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Identifiable Assets	$ 160,554	$ 134,829
Electronic Test [Member]
Identifiable Assets	81,668	32,505
Environmental Technologies [Member]
Identifiable Assets	21,827	16,772
Process Technologies [Member]
Identifiable Assets	55,460	56,842
Corporate Segment [Member]
Identifiable Assets	$ 1,599	$ 28,710