STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Total stock-based compensation	$ 583	$ 592	$ 1,743	$ 2,095
Cost of Sales
Total stock-based compensation	58	75	222	252
Selling, General and Administrative
Total stock-based compensation	377	359	1,081	1,330
Research and Development
Total stock-based compensation	$ 148	$ 158	$ 440	$ 513