Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Statement of Cash Flows [Abstract]      
Cash and cash equivalents $ 8,513,290 $ 14,350,554  
Restricted cash 5,152,789 3,556,211  
Total cash and cash equivalents and restricted cash $ 13,666,079 $ 17,906,765 $ 9,967,752