STOCK-BASED COMPENSATION (Details 1)	9 Months Ended
	Feb. 28, 2017 $ / shares shares
Shares outstanding	5,112,500
Weighted-Average Remaining Life	5 years 3 months 25 days
Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 0.99
Number Exercisable	5,112,500
$0.60 [Member]
Range of exercise prices (in dollars per share) | $ / shares	$ 0.60
Shares outstanding	2,300,000
Weighted-Average Remaining Life	4 years 8 months 19 days
Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 0.60
Number Exercisable	2,300,000
$1.00 [Member]
Range of exercise prices (in dollars per share) | $ / shares	$ 1.00
Shares outstanding	700,000
Weighted-Average Remaining Life	1 year 7 months 17 days
Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 1.00
Number Exercisable	700,000
$1.20 [Member]
Range of exercise prices (in dollars per share) | $ / shares	$ 1.20
Shares outstanding	1,562,500
Weighted-Average Remaining Life	7 years 9 months 29 days
Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 1.20
Number Exercisable	1,562,500
$2.00 [Member]
Range of exercise prices (in dollars per share) | $ / shares	$ 2.00
Shares outstanding	550,000
Weighted-Average Remaining Life	5 years 3 months 29 days
Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 2.00
Number Exercisable	550,000