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Investment in tenancy-in-common (Narrative) (Details) - USD ($)
3 Months Ended 5 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2020
Jul. 31, 2019
Feb. 28, 2020
Oct. 31, 2019
Schedule of Equity Method Investments [Line Items]              
Gain on deconsolidation of subsidiary   $ 27,680,000    
Investment in tenancy-in-common 20,662,000   $ 20,662,000 20,662,000    
Loss on investment in tenancy-in-common 78,000   $ 96,000    
Percentage of management fees of rent collected     5.00%        
Management fees 88,000   $ 150,000        
Insurance commissions $ 22,000   $ 22,000        
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%