SHAREHOLDERS' EQUITY (Details) - Non-vested Stock Options Activity - $ / shares	12 Months Ended
	May 31, 2017	May 31, 2016
Non-vested Stock Options Activity [Abstract]
Nonvested shares at May 31, 2016	673,250
Nonvested shares at May 31, 2016	$ 0.99
Granted	55,000
Granted	$ 1.55	$ 1.17
Vested/Issued	(196,750)
Vested/Issued	$ 0.96
Forfeited	(14,250)
Forfeited	$ 0.92
Nonvested shares at May 31, 2017	517,250	673,250
Nonvested shares at May 31, 2017	$ 0.96	$ 0.99