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Organization, Use of Estimates and Basis of Presentation - Calculation of Earnings Per Share (Details) - USD ($)
3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Basic loss per share computation    
Net loss attributable to common stockholders $ (674,157) $ (2,546,449)
Weighted average common shares outstanding, basic (in shares) 10,982,159 9,835,279
Basic and diluted net loss per share (in dollars per share) $ (0.06) $ (0.26)