Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Total	1,818,016	5,719,484
Preferred Stock [Member]
Total		473,684
Restricted Stock Units [Member]
Total	342,856	349,691
Stock Options [Member]
Total	95,000	1,000,000
Stock Warrants [Member]
Total	1,380,160	3,896,109