FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)	May 31, 2023	May 31, 2022
Assets [Member]
Investment securities	$ 44,875,000	$ 28,609,000
U.S. treasury securities
Investment securities	17,853,000
Level 1 [Member] | Assets [Member]
Investment securities	44,875,000	28,609,000
Level 2 [Member] | Assets [Member]
Investment securities	0	0
Level 3 [Member] | Assets [Member]
Investment securities	0	0
Money Market Funds
Investment securities	27,022,000	28,609,000
Money Market Funds | Level 1 [Member]
Investment securities	27,022,000	28,609,000
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	17,853,000
US Treasury Securities | Level 2 [Member]
Investment securities	0
US Treasury Securities | Level 3 [Member]
Investment securities	$ 0