Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Total	1,980,283	900,227
Preferred Stock [Member]
Total		20,357
Restricted Stock Units [Member]
Total	346,802	33,117
Stock Options [Member]
Total	95,000	100,000
Stock Warrants [Member]
Total	1,538,481	746,753