Leases (Supplemental Cash Flow Information Related To Leases) (Details) - USD ($)	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Leases [Abstract]
Operating cash flows from finance leases	$ 63,614	$ 66,404
Operating cash flows from operating leases	86,633	101,667
Financing cash flows from finance leases	353,258	494,730
Right-of-use assets obtained in exchange for new finance lease liabilities	825,826	709,877
Right-of-use assets obtained in exchange for operating lease liabilities	$ 756,380	$ 758,523