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Management agreement, fees and transactions with related party (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Oct. 31, 2019
Related Party Transaction [Line Items]          
Asset management fees $ 508,000 $ 648,000 $ 1,223,000 $ 1,285,000  
Secured loans receivable 5,136,000   5,136,000   $ 5,053,000
Rotunda 100 members [Member]          
Related Party Transaction [Line Items]          
Secured loans receivable 4,000,000   4,000,000   4,000,000
Unpaid accrued interest $ 1,136,000   $ 1,136,000   1,053,000
Grande Rotunda, LLC [Member]          
Related Party Transaction [Line Items]          
Ownership by noncontrolling owners (percentage) 40.00%   40.00%    
Ownership by parent (percentage) 60.00%   60.00%    
Due to affiliate $ 5,800,000   $ 5,800,000   $ 5,700,000
Damascus Centre, LLC [Member]          
Related Party Transaction [Line Items]          
Ownership by noncontrolling owners (percentage) 30.00%   30.00%    
Ownership by parent (percentage) 70.00%   70.00%    
Managing Agent Hekemian & Co [Member]          
Related Party Transaction [Line Items]          
Asset management fees $ 499,000 636,000 $ 1,198,000 1,255,000  
Leasing commissions and reimbursement of operating expenses 229,000 178,000 704,000 311,000  
Insurance commissions 4,000 20,000 56,000 48,000  
Additional services 0 131,250 0 131,250  
Robert S. Hekemian [Member]          
Related Party Transaction [Line Items]          
Trustee fees and related interest payable in stock units 0 54,000 21,000 114,000  
Consulting fee per month     5,000    
Consulting fee quarterly installments     15,000    
Consulting services expense 0 15,000 8,000 30,000  
Robert S. Hekemian, Jr. [Member]          
Related Party Transaction [Line Items]          
Trustee fees and related interest payable in stock units 117,000 99,000 236,000 194,000  
Allan Tubin [Member]          
Related Party Transaction [Line Items]          
Trustee fees and related interest payable in stock units 8,000 7,000 15,000 7,000  
David Hekemian [Member]          
Related Party Transaction [Line Items]          
Trustee fees and related interest payable in stock units $ 15,000 $ 16,000 $ 31,000 $ 28,000  
Minimum [Member]          
Related Party Transaction [Line Items]          
Asset management fees percentage rate     4.00%    
Maximum [Member]          
Related Party Transaction [Line Items]          
Asset management fees percentage rate     5.00%