Leases - Schedule of Right-of-Use Assets (Details) - USD ($)	Jul. 31, 2021	Apr. 30, 2021
Leases [Abstract]
ROU assets - Operating facility leases	$ 14,308,296	$ 14,308,296
Less: accumulated reduction	(2,065,840)	(1,593,433)
Total ROU assets	$ 12,242,456	$ 12,714,863

Amount of lessee's right to use underlying asset under operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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