FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Aug. 31, 2023	May 31, 2023
Assets [Member]
Investment securities	$ 48,975	$ 44,875
U.S. treasury securities
Investment securities		17,853
Level 1 [Member] | Assets [Member]
Investment securities	48,975	44,875
Level 2 [Member] | Assets [Member]
Investment securities	0	0
Level 3 [Member] | Assets [Member]
Investment securities	0	0
Money Market Funds
Investment securities	48,975	27,022
Money Market Funds | Level 1 [Member]
Investment securities	48,975	27,022
Money Market Funds | Level 2 [Member]
Investment securities	0	0
Money Market Funds | Level 3 [Member]
Investment securities	$ 0	0
US Treasury Securities | Level 1 [Member]
Investment securities		$ 17,853