Note 6 - Revenue From Contracts With Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue	$ 33,991	$ 32,558	$ 63,815	$ 64,477
Semiconductor Market [Member]
Revenue	10,124	18,833	25,091	36,516
Industrial Market [Member]
Revenue	3,415	2,806	7,602	5,943
Automotive [Member]
Revenue	10,735	1,542	14,693	4,139
Life Sciences [Member]
Revenue	2,194	1,135	2,847	2,648
Defense/ Aerospace [Member]
Revenue	3,682	3,890	6,921	6,729
Security [Member]
Revenue	792	936	1,333	1,902
Other Multi Markets [Member]
Revenue	3,049	3,416	5,328	6,600
Thermal Testing Products [Member]
Revenue	4,228	6,172	7,927	11,993
Thermal Process [Member]
Revenue	9,843	11,872	20,798	21,694
Semiconductor Production Test Products [Member]
Revenue	4,014	8,753	10,296	16,859
Video Imaging [Member]
Revenue	1,685	2,434	3,804	5,082
Flying Probe and In-circuit Testers [Member]
Revenue	1,031	1,417	3,775	2,576
Alfamation [Member]
Revenue	9,719	0	11,098	0
Service and Other Products [Member]
Revenue	3,471	1,910	6,117	6,273
End User [Member]
Revenue	27,496	21,877	48,926	43,581
OEM, Integrators and Distributor [Member]
Revenue	$ 6,495	$ 10,681	$ 14,889	$ 20,896