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Investment in tenancy-in-common (Narrative) (Details) - USD ($)
1 Months Ended 8 Months Ended 12 Months Ended
Feb. 28, 2020
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Gain on deconsolidation of subsidiary     $ 27,680,000
Investment in tenancy-in-common   $ 20,101,000 19,383,000 20,101,000  
Loss on investment in tenancy-in-common     295,000 202,000
Percentage of management fees of rent collected 5.00%        
Management fees   241,000 375,000    
Insurance commissions   $ 26,000 51,000    
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%        
Hekemian & Co. [Member]          
Schedule of Equity Method Investments [Line Items]          
Management fees     $ 32,500 $ 32,000