Redeemable Common Stock and Stock Purchase Warrants (Details Textual) (USD $)	0 Months Ended	3 Months Ended
	Mar. 24, 2011	Jul. 31, 2012	Apr. 30, 2012	Jul. 31, 2011	Apr. 30, 2011
Stock Issued During Period, Shares, Acquisitions	12,533,333
Common Stock Purchase Price	$ 0.75
Stock Issued During Period, Value, Share-based Compensation, Gross			$ 9,400,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures			500,000
Warrants Issued During Period For Common Stock					1,266,667
Warrants Exercise Price Per Share					$ 0.90
Percentage Of Common Stock Purchased					25.00%
Incremental Common Stock Value Attributable Put Options				8,200,000
Proceeds From Issuance Of Common Stock and Warrants				9,400,000
Proceeds from Issuance of Warrants				900,000
Incremental Compensation Cost				300,000
Percentage Of Cash Penalties				1.00%
Potential Penalties For Registration Payment				41,000
Warrants and Rights Outstanding				900,000
Increase Decrease In Warrants Fair Value		$ 300,000	$ 600,000