Concentrations (Details) - USD ($)	Apr. 30, 2019	Apr. 30, 2018
Risks and Uncertainties [Abstract]
Amount of cash balance uninsured by FDIC	$ 9,359,208	$ 14,422,499

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant