SHAREHOLDERS' EQUITY (Details) - Activity as to stock options outstanding (USD $)	1 Months Ended	12 Months Ended			12 Months Ended				12 Months Ended
	Apr. 30, 2012	May 31, 2013	May 31, 2012	May 31, 2011 Price Range Per Share $0.30 - $1.30 [Member]	May 31, 2012 Price Range Per Share $0.43 - $0.73 [Member]	May 31, 2012 Price Range Per Share $0.38 - $0.73 [Member]	May 31, 2012 Price Range Per Share $0.38 - $1.30 [Member]	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]
SHAREHOLDERS' EQUITY (Details) - Activity as to stock options outstanding [Line Items]
Options Outstanding, Number of Stock Options				1,000,250				1,004,500				846,500
Options Outstanding, Weighted Average Exercise Price (in Dollars per share)				$ 0.57				$ 0.46				$ 0.47
Options Granted, Number	10,000	30,000			412,500				30,000
Options Granted, Weighted Average Exercise Price (in Dollars per share)	$ 0.73	$ 0.67	$ 0.44		$ 0.44				$ 0.67
Options Exercised, Number		(122,375)	(84,000)			(84,000)				(122,375)
Options Exercised, Weighted Average Exercise Price (in Dollars per share)						$ 0.59				$ 0.42
Options Canceled or Expired, Number							(324,250)				(65,625)
Options Canceled or Expired, Weighted Average Exercise Price (in Dollars per share)							$ 0.71				$ 0.52