Long-Term Debt - Mortgage (Schedule of long-term debt) (Details) - USD ($)	6 Months Ended
	Jan. 31, 2020	Nov. 30, 2019	Jul. 31, 2019
Deferred financing costs
Due After One Year, Total	$ 4,215,436
Bond St. Building Brooklyn NY Two [Member]
Mortgage:
Due Within One Year	989,764		5,298,610
Due After One Year	4,330,054
Deferred financing costs
Due Within One Year			(11,448)
Due After One Year	(114,618)
Due Within One Year, Total	989,764		5,287,162
Due After One Year, Total	$ 4,215,436
Current Annual Interest Rate	4.375%	4.375%
Final Payment Date	Dec. 01, 2024