STOCK-BASED COMPENSATION (Details 1)	3 Months Ended
	Aug. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares outstanding	2,312,500
Weighted-average remaining life	5 years 4 months 13 days
Weighted-average exercise price (in dollars per share) | $ / shares	$ 0.86
Number exercisable	2,312,500
$1.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices (in dollars per share) | $ / shares	$ 1.20
Shares outstanding	1,012,500
Weighted-average remaining life	8 years 7 months 20 days
Weighted-average exercise price (in dollars per share) | $ / shares	$ 1.20
Number exercisable	1,012,500
$0.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices (in dollars per share) | $ / shares	$ 0.60
Shares outstanding	1,300,000
Weighted-average remaining life	2 years 9 months 25 days
Weighted-average exercise price (in dollars per share) | $ / shares	$ 0.60
Number exercisable	1,300,000