Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Total	879,253	747,483
Preferred Stock [Member]
Total
Restricted Stock Units [Member]
Total	32,500	111,228
Stock Options [Member]
Total	100,000	136,895
Stock Warrants [Member]
Total	746,753	499,360