The Impact of COVID-19 on our Results and Operations (Schedule of Allowance For Uncollectible Receivables) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			$ 82,000
Ending Balance	$ 156,000		156,000		$ 82,000
Allowance for Uncollectible Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance			82,000
Charge-offs			92,000		423,232
Recoveries			(18,000)		(91,840)
Rent abatements reclassified to reduce rental income					(249,392)
Ending Balance	156,000		156,000		82,000
Bad Debt Expense [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance
Charge-offs	92,000	40,292	92,000	40,292
Recoveries			(18,000)
Rent abatements reclassified to reduce rental income
Ending Balance	$ 92,000	$ 40,292	$ 92,000	$ 40,292