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Significant Accounting Policies (Details) - Options Activity - $ / shares
 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Options Activity [Abstract]    
Options Outstanding 1,138,625  
Option Outstanding, Exercise Price Weighted Average $ 1.65  
Options Exercised, Shares (98,500)  
Options Exercised, Exercise Price Weighted Average $ 0.77  
Options Cancelled or expired, Shares (23,500)  
Cancelled or expired, Exercise Price Weighted Average $ 2.56  
Option Granted, Shares 139,000 139,000
Option Granted, Exercise Price Weighted Average $ 3.62 $ 3.62
Options Outstanding, Shares 1,155,625  
Options Outstanding, Exercise Price Weighted Average $ 1.94