REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Net sales	$ 10,671	$ 5,646
Systems
Net sales	9,094	3,879
Contactors
Net sales	494	952
Services
Net sales	1,083	815
Wafer-Level
Net sales	10,321	5,143
Test During Burn-In
Net sales	$ 350	$ 503