Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Stock Warrant Activity (Details)

Stockholders' Equity - Schedule of Stock Warrant Activity (Details) - $ / shares	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Warrants with No Class Designation [Member]
Number of Warrants Outstanding, Beginning of Period	527,378	170,236
Number of Warrants, Granted	1,425,224	357,142
Number of Warrants, Exercised	(523,808)
Number of Warrants, Forfeited
Number of Warrants, Canceled
Number of Warrants Outstanding, End of Period	1,428,794	527,378
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period	$ 14.83	$ 31.11
Weighted Average Exercise Price, Granted	9.09	7.00
Weighted Average Exercise Price, Exercised	6.68
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Canceled
Weighted Average Exercise Price of Warrants Outstanding, End of Period	$ 12.00	$ 14.83
Weighted Average Remaining Contractual Life in Years, Beginning of Period	3 years 8 months 23 days	1 year 2 months 30 days
Weighted Average Remaining Contractual Life in Years, Granted	5 years 2 months 5 days	4 years 11 months 1 day
Weighted Average Remaining Contractual Life in Years, Exercised	4 years 11 days	0 years
Weighted Average Remaining Contractual Life in Years, End of Period	4 years 29 days	3 years 8 months 23 days
Class A Warrants [Member]
Number of Warrants Outstanding, Beginning of Period	219,375
Number of Warrants, Granted
Number of Warrants, Exercised	(109,688)
Number of Warrants, Forfeited
Number of Warrants, Canceled
Number of Warrants Outstanding, End of Period	109,687	219,375
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period	$ 11.40
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised	11.40
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Canceled
Weighted Average Exercise Price of Warrants Outstanding, End of Period	$ 11.40	$ 11.40
Weighted Average Remaining Contractual Life in Years, Beginning of Period	4 years 2 months 19 days
Weighted Average Remaining Contractual Life in Years, Granted	0 years
Weighted Average Remaining Contractual Life in Years, Exercised	3 years 2 months 19 days
Weighted Average Remaining Contractual Life in Years, End of Period	3 years 2 months 19 days
Class X Warrants [Member]
Number of Warrants Outstanding, Beginning of Period
Number of Warrants, Granted		109,750
Number of Warrants, Exercised
Number of Warrants, Forfeited		(109,750)
Number of Warrants, Canceled
Number of Warrants Outstanding, End of Period
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period
Weighted Average Exercise Price, Granted		11.40
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited		11.40
Weighted Average Exercise Price, Canceled
Weighted Average Exercise Price of Warrants Outstanding, End of Period
Weighted Average Remaining Contractual Life in Years, Beginning of Period		0 years
Weighted Average Remaining Contractual Life in Years, Granted		6 months
Weighted Average Remaining Contractual Life in Years, End of Period	0 years	0 years
Class Y Warrants [Member]
Number of Warrants Outstanding, End of Period	1,538,481
Warrants exercisable at end of period	1,034,923
Weighted Average Exercise Price of Warrants Outstanding, End of Period	$ 11.96
Weighted Average Exercise Price, exercisable at end of period	10.73
Weighted average fair value of warrants granted during the period	$ 9.00
Weighted Average Remaining Contractual Life in Years, End of Period	4 years 29 days