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Investment in tenancy-in-common (Narrative) (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2020
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Oct. 31, 2020
Schedule of Equity Method Investments [Line Items]              
Gain on deconsolidation of subsidiary     $ 27,680,000 $ 27,680,000  
Investment in tenancy-in-common     19,533,000   19,533,000   $ 20,101,000
Loss on investment in tenancy-in-common     118,000 $ 18,000 145,000 $ 18,000  
Percentage of management fees of rent collected 5.00%            
Management fees   $ 62,000 95,000   187,000    
Insurance commissions   $ 0 $ 0   $ 10,000    
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%