SHAREHOLDERS' EQUITY (Details) - Activity as to stock options outstanding (USD $)	12 Months Ended		12 Months Ended				12 Months Ended
	May 31, 2014	May 31, 2012 Price Range Per Share $0.30-$0.75 [Member]	May 31, 2013 Price Range Per Share $0.65-$0.68 [Member]	May 31, 2013 Price Range Per Share $0.30-$0.73 [Member]	May 31, 2013 Price Range Per Share $0.38-$0.73 [Member]	May 31, 2013 Price Range Per Share $0.38-$0.75 [Member]	May 31, 2014 Price Range Per Share $0.71-$0.84 [Member]	May 31, 2014 Price Range Per Share $0.38-$0.60 [Member]	May 31, 2014 Price Range Per Share $0.43-$0.84 [Member]	May 31, 2014 Price Range Per Share $0.38-$0.84 [Member]
SHAREHOLDERS' EQUITY (Details) - Activity as to stock options outstanding [Line Items]
Options outstanding at May 31, 2012		1,004,500				846,500				860,500
Options outstanding at May 31, 2012		$ 0.46				$ 0.47				$ 0.51
Options granted, number of options	178,000		30,000				178,000
Options granted, weighted average exercise price			$ 0.67				$ 0.75
Options exercised, number of options				(122,375)				(69,000)
Options exercised, weighted average exercise price				$ 0.42				$ 0.51
Options canceled or expired, number of options					(65,625)				(95,000)
Options canceled or expired, weighted average exercise price					$ 0.52				$ 0.59
Options outstanding, number of options		1,004,500				846,500				860,500
Options outstanding, weighted average exercise price		$ 0.46				$ 0.47				$ 0.51