Employee Benefit Plans (Details) - Schedule of Share-based Compensation, Stock Options, Activity - USD ($)	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Schedule Of Share Based Compensation Stock Options Activity Abstract
Options, Shares Outstanding	429,125	615,000	1,059,500
Options, Weighted-Average Exercise Price (in Dollars per share)	$ 9.94	$ 9.88	$ 9.74
Options, Weighted Average Remaining Contractual Term	1 year 3 months 18 days	1 year 9 months 18 days	2 years 2 months 12 days
Options, Aggregate Intrinsic Value (in Dollars)	$ 3,278,704	$ 2,141,905	$ 5,416,783
Options, Shares Exercisable	393,500
Options, Weighted-Average Exercise Price Exercisable (in Dollars per share)	$ 10.06
Options, Weighted Average Remaining Contractual Term Exercisable	1 year 4 months 24 days
Options, Aggregate Intrinsic Value Exercisable (in Dollars)	$ 2,989,785
Available for future grants	906,653
Options, Shares Granted	0	0
Options, Weighted-Average Exercise Price Granted (in Dollars per share)	$ 0	$ 0
Options, Shares Exercised	(42,875)	(247,500)
Options, Weighted-Average Exercise Price Exercised (in Dollars per share)	$ 7.3	$ 8.42
Options, Aggregate Intrinsic Value Exercised (in Dollars)	$ 34,660	$ 573,418
Options, Shares Expired or Canceled	(143,000)	(197,000)
Options, Weighted-Average Exercise Price Expired or Canceled (in Dollars per share)	$ 10.48	$ 10.96