REVENUE (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Net sales	$ 64,961	$ 50,829	$ 16,600
Systems [Member]
Net sales	38,844	25,224	7,250
Test During Burn-In. [Member]
Net sales	1,430	1,903	1,596
Wafer-level [Member]
Net sales	63,531	48,926	15,004
Services [Member]
Net sales	4,244	2,958	3,513
Contactors [Member]
Net sales	21,873	22,647	5,837
Total Product line [Member]
Net sales	$ 64,961	$ 50,829	$ 16,600