Note 19 - Segment Information - Identifiable Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Identifiable Assets	$ 110,066	$ 103,905
Capital expenditures	1,365	994
Corporate, Non-Segment [Member]
Identifiable Assets	4,017	10,123
Capital expenditures	374	52
Electronic Test [Member]
Identifiable Assets	31,143	26,251
Capital expenditures	80	423
Environmental Technologies [Member]
Identifiable Assets	18,040	15,411
Capital expenditures	368	313
Process Technologies [Member]
Identifiable Assets	56,866	52,120
Capital expenditures	$ 543	$ 206