Summary of Significant Accounting Policies - Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 31, 2020	Apr. 30, 2020
Accounting Policies [Abstract]
Balance of allowance for doubtful accounts, beginning of period	$ 317,230	$ 619,514
Bad debt provision	73,684	266,043
Recoveries	0	(115,997)
Write-off of receivables	(13,400)	(452,330)
Balance of allowance for doubtful accounts, end of period	$ 377,514	$ 317,230