Annual report pursuant to Section 13 and 15(d)

Accounts Receivable - Accounts Receivable Balance (Details)

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Accounts Receivable - Accounts Receivable Balance (Details) - USD ($)
Apr. 30, 2020
Apr. 30, 2019
Receivables [Abstract]    
Accounts receivable $ 22,786,847 $ 14,988,744
Long term contractual accounts receivable (6,701,136) (3,085,243)
Less: Allowance for doubtful accounts (1,758,920) (1,247,031)
Accounts receivable, net $ 14,326,791 $ 10,656,470