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Management agreement, fees and transactions with related party (Details) - USD ($)
3 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Nov. 30, 2016
Oct. 31, 2016
Related Party Transaction [Line Items]        
Asset management fees $ 563,000 $ 484,000    
Trustee fees and related interest payable in stock units 211,000      
Secured loans receivable $ 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%      
Ownership by parent (percentage) 60.00%      
Due to affiliate $ 1,300,000      
Damascus Centre, LLC [Member]        
Related Party Transaction [Line Items]        
Ownership by noncontrolling owners (percentage) 30.00%      
Ownership by parent (percentage) 70.00%      
Managing Agent Hekemian & Co [Member]        
Related Party Transaction [Line Items]        
Asset management fees $ 521,000 458,000    
Leasing commissions and reimbursement of operating expenses 198,000 152,000    
Insurance commissions 22,000 49,000    
Redevelopment fees 0 270,000    
Robert S. Hekemian [Member]        
Related Party Transaction [Line Items]        
Trustee fees and related interest payable in stock units 138,000 128,000    
Robert S. Hekemian, Jr. [Member]        
Related Party Transaction [Line Items]        
Trustee fees and related interest payable in stock units $ 17,000 $ 17,000