Financial instruments and credit risk concentrations (Tables)

12 Months Ended

Jul. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Instruments

	July 31, 2022				July 31, 2021
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
Cash and cash equivalents	$	1,020,585	$	1,020,585	$	1,552,389	$	1,552,389
Restricted cash	$	1,049,312	$	1,049,312	$	882,330	$	882,330
Marketable securities	$	2,761,069	$	2,761,069	$	3,901,093	$	3,901,093
Security deposit payable	$	1,051,428	$	1,051,428	$	834,470	$	834,470
Mortgages payable	$	6,451,032	$	6,097,808	$	7,649,632	$	8,088,201