FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Aug. 31, 2022	May 31, 2022
Investment securities	$ 34,733	$ 28,609
Money Market Fund
Investment securities	34,733	28,609
Level 1
Investment securities	34,733	28,609
Level 1 | Money Market Fund
Investment securities	34,733	28,609
Level 2
Investment securities	0	0
Level 2 | Money Market Fund
Investment securities	0	0
Level 3
Investment securities	0	0
Level 3 | Money Market Fund
Investment securities	$ 0	$ 0