STOCKBASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Total stock-based compensation	$ 592	$ 880	$ 2,095	$ 2,186
Cost of Sales
Total stock-based compensation	75	90	252	248
Selling, General and Administrative
Total stock-based compensation	359	487	1,330	1,259
Research and Development
Total stock-based compensation	$ 158	$ 303	$ 513	$ 679