Cash Flow Information (Schedule of supplemental disclosure) (Details) - USD ($)	6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2019
Cash Flow Information
Interest paid, net of capitalized interest of $34,390 (2021) and $64,759 (2020)	$ 147,196	$ 35,210
Income taxes (refunded)	(23,040)	(23,041)
Capitalized interest	$ 34,390	64,759
Non-cash information
Recognition of operating lease right-of-use assets		29,384,531	$ 27,100,000
Recognition of operating lease liabilities		20,143,101	$ 17,900,000
Mortgage refinance		$ 5,255,920