SHAREHOLDERS' EQUITY (Details) - Stock Options Summary - $ / shares	12 Months Ended
	May 31, 2016	May 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 0.38	$ 0.38
Range of Exercise Price, Maximum	0.84	$ 0.71
Range Of Exercise Price $0.43 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	0.43
Range of Exercise Price, Maximum	$ 0.43
Options Outstanding, Number (in Shares)	311,750
Options Outstanding, Weighted Average Remaining Contractual Life	222 days
Options Outstanding, Weighted Average Exercise Price	$ 0.43
Options Exercisable, Number (in Shares)	311,750
Options Exercisable, Weighted Average Exercise Price	$ 0.43
Range Of Exercise Price $0.71 - $0.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	0.71
Range of Exercise Price, Maximum	$ 0.85
Options Outstanding, Number (in Shares)	545,250
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 83 days
Options Outstanding, Weighted Average Exercise Price	$ 0.79
Options Exercisable, Number (in Shares)	214,000
Options Exercisable, Weighted Average Exercise Price	$ 0.76
Range Of Exercise Price $1.04 - $1.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	1.04
Range of Exercise Price, Maximum	$ 1.20
Options Outstanding, Number (in Shares)	342,000
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 215 days
Options Outstanding, Weighted Average Exercise Price	$ 1.17