Leases (Lease Assets And Liabilities Related To Balance Sheet Classification) (Details) - USD ($)	Apr. 30, 2020	Apr. 30, 2019
Leases [Abstract]
Operating Leases: Right-of-use Assets	$ 7,235,166
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating lease current liabilities	$ 2,150,161
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityCurrent
Operating lease noncurrent liabilities	$ 5,281,811
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance Leases: Right-of-use Assets	$ 6,443,954
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Finance lease current liabilities	$ 1,902,295	$ 1,939,374
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:FinanceLeaseLiabilityCurrent
Finance lease noncurrent liabilities	$ 1,884,722	$ 2,862,784
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:FinanceLeaseLiabilityNoncurrent