Leases (Components Of Lease Expense) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Leases [Abstract]
Operating lease cost	$ 353,317	$ 625,339	$ 727,012	$ 1,219,833
Variable lease cost	78,347	73,897	156,694	147,794
Short term lease cost	1,350	1,350	2,700	2,700
Amortization of right-of-use assets	493,042	384,192	912,735	731,567
Interest expense	56,043	74,340	122,401	142,126
Total	$ 982,099	$ 1,159,118	$ 1,921,542	$ 2,244,020