INCOME TAXES (Details 4) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
INCOME TAXES
Unrecognized tax benefit, beginning	$ 2,018	$ 1,928	$ 1,852
Increases related to prior year tax positions	90	12	11
Increases related to current year tax positions	168	78	65
Unrecognized tax benefit, ending	$ 2,276	$ 2,018	$ 1,928