Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Statement of Stockholders' Equity [Abstract]    
Issuance costs $ 175,000 $ 152,250