REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Net Sales	$ 17,206	$ 15,283	$ 42,692	$ 30,540
Systems
Net Sales	9,821	7,172	26,315	14,805
Contactors
Net Sales	6,299	7,426	13,400	13,468
Services
Net Sales	1,086	685	2,977	2,267
Wafer-Level
Net Sales	16,810	14,879	41,532	29,130
Test During Burn-In
Net Sales	396	404	1,160	1,410
Type of Good / Service
Net Sales	17,206	15,283	42,692	30,540
Product Lines
Net Sales	$ 17,206	$ 15,283	$ 42,692	$ 30,540