REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Net Sales	$ 14,815	$ 9,611	$ 25,486	$ 15,257
Contactors
Net Sales	6,607	5,090	7,101	6,042
Services
Net Sales	808	767	1,891	1,582
Wafer-Level
Net Sales	14,401	9,107	24,723	14,250
Test During Burn-In
Net Sales	414	504	763	1,007
Systems
Net Sales	$ 7,400	$ 3,754	$ 16,494	$ 7,633