SHAREHOLDERS' EQUITY (Detail) - Shareholder's Equity (USD $)	0 Months Ended				12 Months Ended
	Apr. 30, 2012	Jan. 31, 2012	May 31, 2011	Feb. 28, 2011	May 31, 2012	May 31, 2011	May 31, 2010
Number of Stock Option And Warrants ,Options and warrants outstanding			1,000,250		1,004,500	1,000,250	1,319,999
Weighted Average Price Range Per Share,Options and warrants outstanding			$0.30 - $1.30		$0.30 - $0.75	$0.30 - $1.30	$0.30 - $1.30
Exercise Price ,Options and warrants outstanding (in Dollars per share)			$ 0.57		$ 0.46	$ 0.57	$ 0.77
Number of Stock Option And Warrants ,Options granted	10,000	402,500	175,000	173,000	412,500	348,000
Weighted Average Price Range Per Share,Options granted					$0.43 - $0.73	$0.38 - $0.40
Exercise Price ,Options granted (in Dollars per share)					$ 0.44	$ 0.39
Number of Stock Option And Warrants ,Options and warrants exercised					(84,000)	(207,500)
Weighted Average Price Range Per Share,Options and warrants exercised					$0.38 - $0.73	$0.40
Exercise Price ,Options and warrants exercised (in Dollars per share)					$ 0.59	$ 0.40
Number of Stock Option And Warrants ,Options and warrants canceled or expired					(324,250)	(460,249)
Weighted Average Price Range Per Share,Options and warrants canceled or expired					$0.38 - $1.30	$0.40 - $0.73
Exercise Price ,Options and warrants canceled or expired (in Dollars per share)					$ 0.71	$ 0.48