Interest rate cap and swap contracts (Details) - USD ($)	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Oct. 31, 2020
Derivative [Line Items]
Interest rate swap contract liability	$ 4,426,000		$ 4,924,000
Net unrealized gain (loss) on interest rate swap contracts	498,000	$ (390,000)
Damascus Centre Swap [Member]
Derivative [Line Items]
Interest rate swap contract liability	551,000		610,000
Wayne PSC swap [Member]
Derivative [Line Items]
Interest rate swap contract liability	1,105,000		1,260,000
Regency Swap [Member]
Derivative [Line Items]
Interest rate swap contract liability	1,280,000		1,385,000
Station Place [Member]
Derivative [Line Items]
Interest rate swap contract liability	1,490,000		1,669,000
Grande Rotunda LLC [Member]
Derivative [Line Items]
Interest rate swap contract liability	$ 0		$ 0