Note 6 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue	$ 30,272	$ 30,941	$ 94,087	$ 95,418
Semiconductor Market [Member]
Revenue	11,410	18,476	36,501	54,992
Industrial Market [Member]
Revenue	3,534	2,456	11,136	8,399
Automotive [Member]
Revenue	6,250	1,775	20,943	5,914
Life Sciences [Member]
Revenue	1,322	1,330	4,169	3,978
Defense/ Aerospace [Member]
Revenue	3,239	3,392	10,160	10,121
Security [Member]
Revenue	666	967	1,999	2,869
Other Multi Markets [Member]
Revenue	3,851	2,545	9,179	9,145
Thermal Testing Products [Member]
Revenue	4,602	4,742	12,529	16,734
Thermal Process [Member]
Revenue	6,362	10,874	27,160	33,565
Semiconductor Production Test Products [Member]
Revenue	7,169	8,574	17,465	25,432
Video Imaging [Member]
Revenue	1,906	1,945	5,710	7,027
Flying Probe and In-circuit Testers [Member]
Revenue	1,100	2,007	4,875	4,584
Alfamation [Member]
Revenue	4,173	0	15,271	0
Service and Other Products [Member]
Revenue	4,960	2,799	11,077	8,076
End User [Member]
Revenue	25,787	21,139	74,713	64,720
OEM, Integrators and Distributor [Member]
Revenue	$ 4,485	$ 9,802	$ 19,374	$ 30,698