Leases (Details) - Schedule of right-of-use assets and operating lease liabilities - USD ($)	Feb. 28, 2021	May 31, 2020
Assets
Right-of-use assets, net	$ 956,023	$ 377,182
Liabilities
Current operating lease liabilities	274,477	188,799
Long-term operating lease liabilities	787,386	$ 192,409
Total operating lease liabilities	$ 1,061,863