Annual report pursuant to Section 13 and 15(d)

5. COMMON STOCK TRANSACTIONS (Details Narrative)

5. COMMON STOCK TRANSACTIONS (Details Narrative) - USD ($)	12 Months Ended
	Apr. 30, 2021	Mar. 31, 2021	Apr. 30, 2020	Apr. 30, 2019
Shelf Offering [Member]
Stock issued new, shares	462,000		222,000
Proceeds from sale of equity	$ 4,700,000		$ 2,100,000
Common Stock [Member] \| 2019 Compensation Agreement [Member] \| Four Consultants [Member]
Stock issued for compensation, shares				2,967
Stock based compensation expense	$ 0		$ 24,726
Unvested shares	0		0
Common Stock [Member] \| 2019 Compensation Agreement [Member] \| Officers [Member]
Stock issued for compensation, shares				4,400
Stock based compensation expense	$ 0		$ 278,891
Unvested shares	0		0
Common Stock [Member] \| Director Letter Agreement [Member] \| Four Nonemployee Members [Member]
Stock issued for compensation, shares			1,333
Stock based compensation expense	$ 19,212		$ 0
Unvested shares	0		0
Common Stock [Member] \| Director Letter Agreement [Member] \| Four Nonemployee Member [Member]
Stock issued for compensation, shares			1,333
Stock based compensation expense	$ 0		$ 65,339
Unvested shares	0		0
Common Stock [Member] \| Director Letter Agreement [Member] \| Four Nonemployee Members [Member]
Stock issued for compensation, shares	1,333
Stock based compensation expense	$ 37,258
Unvested shares	0
Common Stock [Member] \| Medical And Scientific Advisory Board [Member] \| A Consultant [Member]
Stock issued for compensation, shares			1,667
Stock based compensation expense	$ 0		$ 22,584
Unvested shares	0		0
Common Stock [Member] \| Consulting Agreements [Member] \| Four Consultants [Member]
Stock issued for compensation, shares	667
Stock based compensation expense	$ 20,225
Unvested shares	0
Common Stock [Member] \| Consulting Agreements [Member] \| Five Consultants [Member]
Stock issued for compensation, shares			2,133
Stock based compensation expense	$ 0		$ 108,575
Unvested shares	0		133
Common Stock [Member] \| 2020 Compensation Agreement [Member] \| Officers [Member]
Stock issued for compensation, shares			4,400
Stock based compensation expense	$ 89,759		$ 179,521
Unvested shares	0		2,933
Common Stock [Member] \| 2021 Compensation Agreement [Member] \| Four Consultants [Member]
Stock issued for compensation, shares		333
Stock based compensation expense		$ 4,958
Unvested shares		0
Common Stock [Member] \| 2021 Compensation Agreement [Member] \| Officers [Member]
Stock issued for compensation, shares	4,400
Stock based compensation expense	$ 14,740
Unvested shares	2,933
Restricted Stock [Member] \| Stock Subscription Agreements [Member]
Stock issued new, shares	68,667
Proceeds from sale of equity	$ 515,000