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Share-Based Payments (Details Textual) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Feb. 22, 2010
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2013
Restricted Stock [Member]
Apr. 30, 2011
Chief Executive Officer and President [Member]
Feb. 18, 2011
Equity Incentive Plan 2010 [Member]
Maximum [Member]
Feb. 18, 2011
Equity Incentive Plan 2010 [Member]
Minimum [Member]
Feb. 22, 2010
Director Compensation Plan [Member]
Apr. 30, 2013
April 2011 Private Placement [Member]
Apr. 30, 2013
January 2013 Private Placement [Member]
Apr. 30, 2013
Equity Instrument [Member]
Allocated Share-based Compensation Expense   $ 2,376,000 $ 3,323,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Outstanding   3,276,667                    
Warrants Issued During Period for Common Stock   100,000               1,266,667 1,860,000 150,000
Warrant Expiration Date   Jul. 31, 2014                    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures             30,000,000          
Percentage of Strike Price on Fair Market Value               100.00%        
Stock Options Award Shares to Purchase Common Stock 100,000               50,000      
Payment of Tax Liability in Respect of Restricted Stock Awards                 15,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Percentage                 25.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.41 $ 0.58                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           10,000,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Service Based, Vesting       5,000,000                
Share-based Compensation Arrangement by Share-based Payment Award Options, Service and Performance Based Vesting Provisions       5,000,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   34,000 84,000                  
Stock Compensation Expense Related to Nonvested Restricted Stock Awards   $ 15,000                    
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   7 years 7 months 6 days 8 years 4 months 24 days   6 months