Employee Benefit Plans (Details) - Schedule of Share-based Compensation, Stock Options, Activity - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Schedule of Share-based Compensation, Stock Options, Activity [Abstract]
Options, Shares Outstanding	615,000	1,059,500	1,499,750
Options, Weighted-Average Exercise Price (in Dollars per share)	$ 9.88	$ 9.74	$ 9.17
Options, Weighted Average Remaining Contractual Term	1 year 292 days	2 years 73 days	3 years
Options, Aggregate Intrinsic Value (in Dollars)	$ 2,141,905	$ 5,416,783	$ 6,660,150
Options, Shares Exercisable	537,500
Options, Weighted-Average Exercise Price Exercisable (in Dollars per share)	$ 10.06
Options, Weighted Average Remaining Contractual Term Exercisable	1 year 292 days
Options, Aggregate Intrinsic Value Exercisable (in Dollars)	$ 1,959,463
Available for future grants	755,923
Options, Shares Granted	0	0
Options, Weighted-Average Exercise Price Granted (in Dollars per share)	$ 0	$ 0
Options, Shares Exercised	(247,500)	(171,250)
Options, Weighted-Average Exercise Price Exercised (in Dollars per share)	$ 8.42	$ 5.48
Options, Aggregate Intrinsic Value Exercised (in Dollars)	$ 573,418	$ 781,680
Options, Shares Expired or Canceled	(197,000)	(269,000)
Options, Weighted-Average Exercise Price Expired or Canceled (in Dollars per share)	$ 10.96	$ 9.26