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Investment in tenancy-in-common (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
Feb. 28, 2020
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Oct. 31, 2020
Schedule of Equity Method Investments [Line Items]              
Gain on deconsolidation of subsidiary     $ 27,680,000  
Investment in tenancy-in-common   19,433,000     19,433,000   $ 20,101,000
Loss on investment in tenancy-in-common   100,000 78,000   245,000 $ 96,000  
Percentage of management fees of rent collected 5.00%            
Management fees   93,000 88,000 $ 150,000 280,000    
Insurance commissions   $ 37,000 $ 22,000 $ 22,000 $ 47,000    
S And A Commercial Associates Limited Partnership [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of ownership interest 65.00%            
Pierre Towers, LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of ownership interest 100.00%            
TIC Agreement [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of ownership interest 65.00%