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Stock Options and Warrants (Tables)
12 Months Ended
May 31, 2019
Stock Option and Warrant Activity
        Weighted    
        Average    
     Weighted  Remaining    
  Number of  Average  Contractual Life  Aggregate 
  Shares  Exercise Price  in Years  Intrinsic Value 
Options and warrants outstanding - May 31, 2018
  132,385,269  $0.80   3.78  $3,673 
Granted
  64,834,121  $0.57   —     —   
Exercised
  (7,541,279) $0.40   —     —   
Forfeited/expired/cancelled
  (11,086,262) $0.81   —     —   
Options and warrants outstanding - May 31, 2019
  178,591,849   0.71   3.75   896,400 
Outstanding exercisable - May 31, 2019
  175,116,515  $0.71   3.66  $896,400