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, 2020	Apr. 30, 2019
Number of Warrants Outstanding, End of Period	746,753
Warrants exercisable at end of period	746,753
Weighted Average Exercise Price of Warrants Outstanding, End of Period	$ 7.41
Weighted Average Exercise Price, exercisable at end of period	7.78
Weighted average fair value of warrants granted during the period	$ 4.21
Weighted Average Remaining Contractual Life in Years, End of Period	3 years 10 months 17 days
Warrants [Member]
Number of Warrants Outstanding, Beginning of Period	170,236	170,236
Number of Warrants, Granted	357,142
Number of Warrants, Exercised
Number of Warrants, Forfeited, with no financial effect
Number of Warrants, Cancelled
Number of Warrants Outstanding, End of Period	527,378	170,236
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period	$ 31.11	$ 31.11
Weighted Average Exercise Price, Granted	7.00
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited, with no financial effect
Weighted Average Exercise Price, Cancelled/Expired
Weighted Average Exercise Price of Warrants Outstanding, End of Period		$ 31.11
Weighted Average Remaining Contractual Life in Years, Beginning of Period	1 year 2 months 30 days	1 year 2 months 30 days
Weighted Average Remaining Contractual Life in Years, Granted	4 years 11 months 1 day
Weighted Average Remaining Contractual Life in Years, End of Period	3 years 8 months 23 days	1 year 2 months 30 days
Class A Warrants [Member]
Number of Warrants Outstanding, Beginning of Period
Number of Warrants, Granted	219,375
Number of Warrants, Exercised
Number of Warrants, Forfeited, with no financial effect
Number of Warrants, Cancelled
Number of Warrants Outstanding, End of Period	219,375
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, with no financial effect
Weighted Average Exercise Price, Cancelled/Expired
Weighted Average Exercise Price of Warrants Outstanding, End of Period	$ 11.40
Weighted Average Remaining Contractual Life in Years, Beginning of Period	0 years
Weighted Average Remaining Contractual Life in Years, Granted	4 years 2 months 19 days
Weighted Average Remaining Contractual Life in Years, End of Period	4 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, with no financial effect	(109,750)
Number of Warrants, Cancelled
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, with no financial effect	11.40
Weighted Average Exercise Price, Cancelled/Expired
Weighted Average Exercise Price of Warrants Outstanding, End of Period
Weighted Average Remaining Contractual Life in Years, Granted	6 months
Class Y Warrants [Member]
Number of Warrants Outstanding, Beginning of Period
Number of Warrants, Granted
Number of Warrants, Exercised
Number of Warrants, Forfeited, with no financial effect
Number of Warrants, Cancelled
Number of Warrants Outstanding, End of Period
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited, with no financial effect
Weighted Average Exercise Price, Cancelled/Expired
Weighted Average Exercise Price of Warrants Outstanding, End of Period