Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Income Tax (Details)

v3.21.2
Summary of Significant Accounting Policies - Income Tax (Details) - USD ($)
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Accounting Policies [Abstract]      
Federal statutory income tax rate, percent 21.00% 21.00% 21.00%
Income tax expense $ 0 $ 0 $ (2,827,000)