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Significant Accounting Policies (Details) - Options Activity
 9 Months Ended
Feb. 28, 2017
$ / shares
shares
Options Activity [Abstract]  
Outstanding May 31, 2016 | shares 1,199,000
Outstanding May 31, 2016 | $ / shares $ 0.81
Granted | shares 55,000
Granted | $ / shares $ 1.55
Exercised | shares (335,500)
Exercised | $ / shares $ 0.46
Cancelled or expired | shares (11,500)
Cancelled or expired | $ / shares $ 0.97
Outstanding February 28, 2017 | shares 907,000
Outstanding February 28, 2017 | $ / shares $ 0.98