Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Reconciliation of the numerator and denominator used in computing basic and diluted net loss per share (Details)

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Summary of Significant Accounting Policies - Reconciliation of the numerator and denominator used in computing basic and diluted net loss per share (Details) (USD $)
3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Summary Of Significant Accounting Policies - Reconciliation Of Numerator And Denominator Used In Computing Basic And Diluted Net Loss Per Share Details        
Loss (numerator) $ (1,247,757) $ (1,178,874) $ (2,223,474) $ (2,032,831)
Shares (denominator) 10,703,309 10,703,309 10,703,309 10,548,961
Net loss per share, basic $ (0.12) $ (0.11) $ (0.21) $ (0.19)
Effect of dilutive securities – stock options            
Effect of dilutive securities – warrants            
Loss (numerator) $ (1,247,757) $ (1,178,874) $ (2,223,474) $ (2,032,831)
Shares (denominator) 10,703,309 10,703,309 10,703,309 10,548,961
Net loss per share, diluted $ (0.12) $ (0.11) $ (0.21) $ (0.19)