12. Lease (Details) - USD ($)	9 Months Ended
Jan. 31, 2020	Apr. 30, 2019
Operating Lease Monthly Rental Obligation	$ 3,250
Right of use lease	62,825	$ 0
Fair Value of Operating Lease
Right of use lease	91,474
Lease Liability
Right of use lease	$ 28,649

Amount, after accumulated amortization, of right-of-use asset from finance 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=121603541&loc=SL77918627-209977

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