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Share-Based Payments (Details 4) (Warrant [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Warrant [Member]
      
Number of Shares, Beginning Balance 1,416,667 1,912,019  
Number of Shares, Granted 1,860,000 0  
Number of Shares, Exercised 0 (495,352)  
Number of Shares, Forfeited 0 0  
Number of Shares, Expired 0 0  
Number of Shares, Ending Balance 3,276,667 1,416,667 1,912,019
Weighted Average Exercise Price, Beginning Balance $ 0.91 $ 0.73  
Weighted Average Exercise Price, Granted $ 0.66 $ 0  
Weighted Average Exercise Price, Exercised $ 0 $ 0.20  
Weighted Average Exercise Price, Forfeited $ 0 $ 0  
Weighted Average Exercise Price, Expired $ 0 $ 0  
Weighted Average Exercise Price, Ending Balance $ 0.61 $ 0.91 $ 0.73
Weighted Average Remaining Contractual Life (Years), Balance 3 years 10 months 24 days 3 years 9 months 18 days 3 years 8 months 12 days
Weighted Average Remaining Contractual Life (Years), Granted 4 years 9 months 18 days    
Aggregate Intrinsic Value, Beginning Balance $ 0 $ 524  
Aggregate Intrinsic Value, Exercised   234  
Aggregate Intrinsic Value, Ending Balance $ 0 $ 0 $ 524