Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)

v3.19.2
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Statement of Stockholders' Equity [Abstract]    
Issuance costs $ 175,000 $ 175,000