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Redeemable Common Stock and Stock Purchase Warrant (Details Textual) (USD $)
 0 Months Ended 6 Months Ended 12 Months Ended
Mar. 24, 2011
Oct. 31, 2012
Oct. 31, 2011
Apr. 30, 2012
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