Significant Accounting Policies (Details) - Options Activity	6 Months Ended
	Nov. 30, 2016 $ / shares shares
Options Activity [Abstract]
Outstanding May 31, 2016 | shares	1,199,000
Outstanding May 31, 2016 | $ / shares	$ 0.81
Exercised | shares	(130,875)
Exercised | $ / shares	$ 0.43
Cancelled or expired | shares	(5,000)
Cancelled or expired | $ / shares	$ 0.96
Granted | shares	55,000
Granted | $ / shares	$ 1.55
Outstanding November 30, 2016 | shares	1,118,125
Outstanding November 30, 2016 | $ / shares	$ 0.89