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Share-Based Payments (Details 3) (USD $)
3 Months Ended 9 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Weighted Average Grant Date Fair Value Per Share, Granted $ 0.27 $ 0.52 $ 0.36 $ 0.57
Restricted Stock [Member]
       
Shares, Nonvested, Begining Balance     25,000  
Shares, Granted     100,000  
Shares, Vested     (50,000)  
Shares, Forfeited     0  
Shares, Expired     0  
Shares, Nonvested, Ending Balance 75,000   75,000  
Weighted Average Grant Date Fair Value Per Share, Nonvested, Begining Balance     $ 0.75  
Weighted Average Grant Date Fair Value Per Share, Granted     $ 0.30  
Weighted Average Grant Date Fair Value Per Share, Vested     $ 0.53  
Weighted Average Grant Date Fair Value Per Share, Forfeited     $ 0  
Weighted Average Grant Date Fair Value Per Share, Expired     $ 0  
Weighted Average Grant Date Fair Value Per Share, Nonvested, Ending Balance $ 0   $ 0