Leases (Lease Assets And Liabilities Related To Balance Sheet Classification) (Details) - USD ($)	Oct. 31, 2020	Apr. 30, 2020
Leases [Abstract]
Operating Leases: Right-of-use Assets	$ 7,333,290	$ 7,235,166
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating lease current liabilities	$ 2,078,990	$ 2,150,161
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating lease current liabilities	Operating lease current liabilities
Operating lease noncurrent liabilities	$ 5,457,117	$ 5,281,811
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating lease noncurrent liabilities	Operating lease noncurrent liabilities
Finance Leases: Right-of-use Assets	$ 5,702,281	$ 6,443,954
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property Plant And Equipment Net	Property Plant And Equipment Net
Finance lease current liabilities	$ 1,650,763	$ 1,902,295
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Finance lease current liabilities	Finance lease current liabilities
Finance lease noncurrent liabilities	$ 1,124,309	$ 1,884,722
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Finance lease noncurrent liabilities	Finance lease noncurrent liabilities