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Intangible Assets (Details 1) - USD ($)
Jul. 31, 2015
Apr. 30, 2015
Estimated future annual amortization expense    
2016 $ 89,602  
2017 119,469  
2018 119,469  
2019 119,469  
2020 119,469  
Thereafter 1,605,802  
Intangible assets, net $ 2,173,280 $ 2,203,393