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Cash and Cash Equivalents (Tables)
3 Months Ended
Aug. 31, 2021
Cash and Cash Equivalents [Abstract]  
Schedule of considers short-term highly liquid investments
   August 31,
2021
   May 31,
2021
 
         
Cash in banks  $7,552,534   $7,317,517 
Money market funds   53,408    53,129 
           
   $7,605,942   $7,370,646