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Intangible Assets (Details 1) - USD ($)
Jan. 31, 2016
Apr. 30, 2015
Estimated future annual amortization expense    
2016 $ 29,367  
2017 119,469  
2018 119,469  
2019 119,469  
2020 119,469  
Thereafter 1,605,811  
Intangible assets, net $ 2,113,054 $ 2,203,393