Excercise of Stock Options (Details) (Director [Member], USD $)	3 Months Ended
	Aug. 31, 2012
Director [Member]
Excercise of Stock Option (Textual)
Common stock options excercised	8,000
Common stock options excercise price	$ 0.75
Common stock option grant date	May 16, 2005
Common stock option vest date	May 16, 2006
Common stock option expiration date	May 16, 2015