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Mortgage financings (Details) - USD ($)
3 Months Ended 6 Months Ended
May. 02, 2016
Feb. 01, 2010
Apr. 30, 2016
Apr. 30, 2016
Apr. 30, 2015
Apr. 22, 2016
Oct. 31, 2015
Dec. 26, 2012
Debt Instrument [Line Items]                
Total loan carrying amount     $ 321,190,000 $ 321,190,000     $ 307,899,000  
Construction and pre-development costs       12,786,000 $ 25,800,000      
Proceeds from construction loan       11,834,000 $ 25,637,000      
People's United Bank [Member]                
Debt Instrument [Line Items]                
Total loan carrying amount     $ 21,100,000 $ 21,100,000        
People's United Bank [Member] | Tranche One [Member]                
Debt Instrument [Line Items]                
Loan amount               $ 20,000,000
Fixed interest rate     3.81% 3.81%        
Basis points, interest rate     2.10% 2.10%        
Maturity date of loan     Jan. 03, 2023 Jan. 03, 2023        
People's United Bank [Member] | Tranche Two [Member]                
Debt Instrument [Line Items]                
Loan amount           $ 2,320,000    
Amount of loan readily available           470,000    
Amount of loan held in escrow           $ 1,850,000    
Fixed interest rate     3.53% 3.53%        
Basis points, interest rate     2.10% 2.10%        
Maturity date of loan     Jan. 03, 2023 Jan. 03, 2023        
Provident Bank [Member]                
Debt Instrument [Line Items]                
Loan amount     $ 16,200,000 $ 16,200,000        
Basis points, interest rate       1.25%        
Total loan carrying amount     $ 5,000,000 $ 5,000,000        
Maturity date of loan       Dec. 15, 2024        
Annual interest costs     3.75% 3.75%        
Monthly principal payment amount       $ 27,807        
Wayne PSC, LLC Loan [Member]                
Debt Instrument [Line Items]                
Maturity date of loan Sep. 01, 2016              
Monthly principal payment amount $ 206,960              
Final payment due on loan upon maturity $ 24,300,000              
Baltimore, MD [Member] | People's United Bank [Member]                
Debt Instrument [Line Items]                
Refinanced loan amount   $ 19,500,000            
Loan amount   $ 22,500,000 $ 120,000,000 $ 120,000,000        
Basis points, interest rate       2.25%        
Term of the loan       4 years        
Baltimore, MD [Member] | Notes Payable, Other Payables [Member]                
Debt Instrument [Line Items]                
Construction and pre-development costs       $ 86,000,000        
Line of credit     $ 105,000,000 105,000,000        
Repayments of debt to affiliate       $ 19,000,000