Interest rate cap and swap contracts (Details) - USD ($)		1 Months Ended	3 Months Ended
	Jan. 10, 2022	Dec. 30, 2021	Jan. 31, 2022	Jan. 31, 2021	Oct. 31, 2021
Derivative [Line Items]
Interest rate swap contract liability			$ 1,117,000		$ 2,308,000
Net unrealized gain (loss) on interest rate swap contracts			1,262,000	$ 498,000
Wayne PSC swap [Member]
Derivative [Line Items]
Interest rate swap contract asset			71,000
Interest rate swap contract liability					348,000
Regency Swap [Member]
Derivative [Line Items]
Interest rate swap contract liability			475,000		750,000
Station Place [Member]
Derivative [Line Items]
Interest rate swap contract liability			$ 642,000		932,000
Damascus Centre Swap [Member]
Derivative [Line Items]
Interest rate swap contract liability					278,000
Grande Rotunda [Member]
Derivative [Line Items]
Interest rate swap contract liability					$ 0
Purchase and Sale Agreement of Rotunda Property [Member]
Derivative [Line Items]
Repayments of mortgage debt		$ 116,500,000
Purchase and Sale Agreement of Damascus Property [Member]
Derivative [Line Items]
Repayments of mortgage debt	$ 18,200,000
Swap breakage fees	$ 213,000