Cash Flow Information (Schedule of supplemental disclosure) (Details) - USD ($)	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Cash Flow Information
Interest paid, net of capitalized interest of $64,759 (2020) and $20,155 (2019)	$ 35,210	$ 78,146
Income taxes paid (refunded)	(23,041)
Capitalized interest	64,759	$ 20,155
Non-cash information
Recognition of operating lease right-of-use assets	29,384,531
Recognition of operating lease liabilities	20,143,101
Mortgage refinance	$ 5,255,920