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Management agreement, fees and transactions with related party (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Nov. 30, 2016
Oct. 31, 2016
Related Party Transaction [Line Items]            
Asset management fees $ 593,000 $ 502,000 $ 1,156,000 $ 986,000    
Trustee fees and related interest payable in stock units     423,000      
Secured loans receivable $ 5,451,000   $ 5,451,000   $ 5,451,000 $ 5,451,000
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%      
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 $ 2,800,000   $ 2,800,000      
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 $ 553,000 477,000 $ 1,074,000 935,000    
Leasing commissions and reimbursement of operating expenses 198,000 154,000 397,000 306,000    
Insurance commissions 33,000 15,000 55,000 64,000    
Redevelopment fees 0 88,000 0 359,000    
Robert S. Hekemian [Member]            
Related Party Transaction [Line Items]            
Trustee fees and related interest payable in stock units 135,000 142,000 273,000 270,000    
Robert S. Hekemian, Jr. [Member]            
Related Party Transaction [Line Items]            
Trustee fees and related interest payable in stock units $ 17,000 $ 17,000 $ 34,000 $ 34,000