STOCK-BASED COMPENSATION (Details) - Employee Stock Option [Member] - $ / shares	3 Months Ended	12 Months Ended
	Aug. 31, 2015	May. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at Begining	1,012,500	1,247,917
Granted	1,300,000
Exercised
Expired or cancelled		(235,417)
Outstanding at end	2,312,500	1,012,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [RollForward]
Outstanding at Beginning	$ 1.20	$ 1.53
Granted	$ 0.60
Exercised
Expired or cancelled		$ 2.95
Outstanding at end	$ 0.86	$ 1.20