XML 33 R21.htm IDEA: XBRL DOCUMENT v3.20.2
5. Accrued Expenses and Other Current Liabilities (Tables)
3 Months Ended
Aug. 31, 2020
Payables and Accruals [Abstract]  
Schedule of accrued expenses and other current liabilities
   August 31, 2020   May 31, 2020 
Crossflo acquisition liability  $177,244   $ 
Accrued legal   15,000     
Other accrued expenses   1,928     
Total accrued expenses and other current liabilities  $194,172   $