Note 6 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue	$ 29,824	$ 31,919
Semiconductor Market [Member]
Revenue	14,967	17,683
Industrial Market [Member]
Revenue	4,187	3,137
Automotive [Member]
Revenue	3,958	2,597
Life Sciences [Member]
Revenue	653	1,513
Defense/ Aerospace [Member]
Revenue	3,239	2,839
Security [Member]
Revenue	541	966
Other Multi Markets [Member]
Revenue	2,279	3,184
Thermal Testing Products [Member]
Revenue	3,699	5,820
Thermal Process [Member]
Revenue	10,955	9,822
Semiconductor Production Test Products [Member]
Revenue	6,282	8,105
Video Imaging [Member]
Revenue	2,119	2,648
Flying Probe and In-circuit Testers [Member]
Revenue	2,744	1,160
Alfamation [Member]
Revenue	1,379	0
Service and Other Products [Member]
Revenue	2,646	4,364
End User [Member]
Revenue	21,430	21,704
OEM, Integrators and Distributor [Member]
Revenue	$ 8,394	$ 10,215