Schedule of Stockholders Equity Deferred Share Unit Plan (Details) (USD $)	6 Months Ended
	Oct. 31, 2012
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 1	$ 1,588,064
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 2	0.83
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 3	133,443
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 4	2.90
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 5	0
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 6	0
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 7	$ 1,721,507
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 8	1.01