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Annual report pursuant to Section 13 and 15(d)

Income Taxes (Deferred Tax Asset Valuation Allowance Rollforward) (Details)

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Income Taxes (Deferred Tax Asset Valuation Allowance Rollforward) (Details) (USD $)
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Income Taxes [Abstract]    
Valuation allowance, beginning of year $ (4,684,841) $ (4,166,510)
(Increase) during period (1,979,374) (518,331)
Valuation allowance, ending balance $ (6,664,215) $ (4,684,841)