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Management agreement, fees and transactions with related party (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Oct. 31, 2015
Related Party Transaction [Line Items]          
Asset management fees $ 515,000 $ 504,000 $ 1,501,000 $ 1,489,000  
Trustee fees and related interest payable in stock units     574,000    
Secured loans receivable 5,451,000   5,451,000   $ 5,451,000
Managing Agent Hekemian & Co [Member]          
Related Party Transaction [Line Items]          
Asset management fees 485,000 479,000 1,419,000 1,412,000  
Leasing commissions and reimbursement of operating expenses 147,000 77,000 452,000 213,000  
Insurance commissions 101,000 98,000 164,000 155,000  
Affiliated Entity 1 [Member]          
Related Party Transaction [Line Items]          
Redevelopment fees 33,000 340,000 391,000 1,133,000  
Robert S. Hekemian [Member]          
Related Party Transaction [Line Items]          
Trustee fees and related interest payable in stock units 131,000 137,000 401,000 403,000  
Robert S. Hekemian, Jr. [Member]          
Related Party Transaction [Line Items]          
Trustee fees and related interest payable in stock units $ 16,000 $ 18,000 $ 49,000 $ 49,000  
Grande Rotunda, LLC [Member]          
Related Party Transaction [Line Items]          
Ownership by noncontrolling owners (percentage) 40.00%   40.00%   40.00%
Ownership by parent (percentage) 60.00%   60.00%   60.00%
Damascus Centre, LLC [Member]          
Related Party Transaction [Line Items]          
Ownership by noncontrolling owners (percentage) 30.00%   30.00%   30.00%
Ownership by parent (percentage) 70.00%   70.00%   70.00%