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Redeemable Common Stock and Stock Purchase Warrants (Details Textual) (USD $)
 1 Months Ended 12 Months Ended
Jan. 28, 2013
Mar. 24, 2011
Apr. 30, 2013
Apr. 30, 2012
Stock Issued During Period, Shares, Acquisitions 18,600,000 12,533,333    
Common Stock Purchase Price $ 0.50 $ 0.75    
Stock Issued During Period, Value, Share-based Compensation, Gross $ 9,300,000 $ 9,400,000    
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures 500,000 500,000    
Warrants Issued During Period for Common Stock     100,000  
Warrants Exercise Price Per Share     $ 0.66  
Proceeds from Issuance of Common Stock 9,100,000      
Purchase Price Percentage     1.00%  
Purchase Price Limit Percentage     10.00%  
Increase (Decrease) in Warrants Fair Value     1,050,000 600,000
Minimum [Member]
        
Potential Penalties Amount     50,000  
Maximum [Member]
        
Potential Penalties Amount     130,000  
January 2013 Private Placement [Member]
        
Common Stock Purchase Price     $ 0.50  
Warrants Issued During Period for Common Stock     1,860,000  
Warrants Exercise Price Per Share     $ 0.66  
Warrants Expiration     5 years  
Common Stock Repurchase Price Per Share $ 0.50      
Percentage of Common Stock Purchased 25.00%      
Issuance Of Additional Common Shares To Investors 1,064,658      
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value     8,800,000  
Proceeds from Issuance of Common Stock and Warrants     9,300,000  
Proceeds from Issuance of Warrants     400,000  
Incremental Compensation Cost     200,000  
Warrants and Rights Outstanding     800,000  
April 2011 Private Placement [Member]
        
Warrants Issued During Period for Common Stock     1,266,667  
Warrants Exercise Price Per Share     $ 0.90  
Warrants Expiration     5 years  
Common Stock Repurchase Price Per Share   $ 0.75    
Percentage of Common Stock Purchased   25.00%    
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value     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  
April 2011 Private Placement [Member] | Minimum [Member]
        
Warrants Exercise Price Per Share     $ 0.50  
April 2011 Private Placement [Member] | Maximum [Member]
        
Warrants Exercise Price Per Share     $ 0.90