Significant Accounting Policies (Details) - Options Activity	3 Months Ended
	Aug. 31, 2017 $ / shares shares
Options Activity [Abstract]
Outstanding May 31, 2017 | shares	897,000
Outstanding May 31, 2017 | $ / shares	$ 0.98
Granted | shares	52,000
Granted | $ / shares	$ 2.41
Forfeited | shares	(3,000)
Forfeited | $ / shares	$ 1.04
Exercised | shares	(1,000)
Exercised | $ / shares	$ 1.04
Outstanding August 31, 2017 | shares	945,000
Outstanding August 31, 2017 | $ / shares	$ 1.06