Note 14 - Segment Information - Identifiable Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Identifiable Assets	$ 159,527	$ 134,829
Electronic Test [Member]
Identifiable Assets	75,508	32,505
Environmental Technologies [Member]
Identifiable Assets	16,624	16,772
Process Technologies [Member]
Identifiable Assets	57,815	56,842
Corporate Segment [Member]
Identifiable Assets	$ 9,580	$ 28,710