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Investment in tenancy-in-common (Narrative) (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Feb. 28, 2020
Oct. 31, 2019
Schedule of Equity Method Investments [Line Items]              
Gain on deconsolidation of subsidiary   $ 27,680 $ 27,680    
Investment in tenancy-in-common $ 20,740 20,740   20,740    
Loss on investment in tenancy-in-common   $ (18) $ (18)    
Percentage of management fees of rent collected 5.00%            
Management fees $ 62            
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%