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Management agreement, fees and transactions with related parties (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2018
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Oct. 30, 2013
Oct. 31, 2017
Nov. 30, 2016
Related Party Transaction [Line Items]                
Asset management fees   $ 633,000 $ 593,000 $ 1,893,000 $ 1,749,000      
Consulting services expense   19,200   15,000        
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   $ 5,300,000   $ 5,300,000     5,200,000  
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   $ 612,000 555,000 $ 1,806,000 1,629,000      
Leasing commissions and reimbursement of operating expenses   321,000 305,000 591,000 702,000      
Leasing commissions       522,500        
Insurance commissions   112,000 116,000 161,000 171,000      
Redevelopment fees   0 467,500 1,195,000 467,500      
Consulting services expense       240,000        
Grande Rotunda LLC Construction Loan [Member]                
Related Party Transaction [Line Items]                
Consulting services expense       400,000        
Provident Bank [Member]                
Related Party Transaction [Line Items]                
Consulting services expense       32,500        
Grande Rotunda LLC [Member]                
Related Party Transaction [Line Items]                
Fee amount $ 900,000 45,000   1,400,000   $ 500,000    
Affiliated Entity 1 [Member]                
Related Party Transaction [Line Items]                
Development fees included in accounts payable   900,000   900,000     $ 900,000  
Hekemian and Resources [Member]                
Related Party Transaction [Line Items]                
Fee amount       900,000        
Robert S. Hekemian [Member]                
Related Party Transaction [Line Items]                
Trustee fees and related interest payable in stock units   54,000 132,000 309,000 405,000      
Consulting fee per month       5,000        
Consulting fee quarterly installments       15,000        
Robert S. Hekemian, Jr. [Member]                
Related Party Transaction [Line Items]                
Trustee fees and related interest payable in stock units   54,000 16,000 96,000 50,000      
David Hekemian [Member]                
Related Party Transaction [Line Items]                
Trustee fees and related interest payable in stock units   $ 13,000 $ 0 $ 16,000 $ 0