Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Earnings Per Share of Common Stock
Net income	$ 3,598,000	$ 2,546,000
Basic EPS	$ 3,598,000	$ 2,546,000
Basic EPS, shares	3,598,000	4,958,769
Basic EPS, per share	$ 0.73	$ 0.51
Effect of dilutive convertible preferred Stock
Effect of dilutive convertible preferred Stock, shares	20,500	20,500
Effect of dilutive convertible preferred Stock, per share	$ (0.0030)	$ (0.0019)
Diluted EPS	$ 3,284,000	$ 2,546,000
Diluted EPS, shares	4,983,047	4,977,584
Diluted EPS, per share	$ 0.72	$ 0.51