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Mortgages, construction loan payable and credit line (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 28, 2017
Jan. 14, 2013
Sep. 29, 2016
Feb. 01, 2010
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Nov. 23, 2016
Jun. 30, 2016
Apr. 22, 2016
Dec. 29, 2014
Debt Instrument [Line Items]                      
Amount drawn on loan         $ 323,435,000 $ 329,719,000          
Repayment of mortgages and construction loan         34,254,000 28,314,000 $ 4,117,000        
Construction and pre-development costs         13,535,000 [1] $ 48,576,000 [2]        
Amount due within five years         $ 20,291,000            
Mortgages [Member] | Westwood, NJ#1 [Member]                      
Debt Instrument [Line Items]                      
Refinanced loan amount   $ 8,000,000                  
Mortgages [Member] | Wayne, PSC LLC [Member]                      
Debt Instrument [Line Items]                      
Refinanced loan amount     $ 24,200,000                
Fixed interest rate         3.625%            
Membership interest percentage         40.00%            
Description of variable interest rate        

a reduction in interest rate from 6.04% to 3.625%

           
Repurchase amount of acquisition loan         $ 400,000            
Net proceeds from refinancing of debt         1,000,000            
Mortgages [Member] | Provident Bank Mortgage [Member]                      
Debt Instrument [Line Items]                      
Loan amount                     $ 16,200,000
Mortgages [Member] | Grande Rotunda, LLC [Member]                      
Debt Instrument [Line Items]                      
Refinanced loan amount         $ 121,900,000            
Basis points, interest rate         2.85%            
Loan amount         $ 3,400,000            
Loan To Value         25.00%            
Mortgages [Member] | Grande Rotunda, LLC [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Replenish account balance                 $ 500,000    
Mortgages [Member] | Grande Rotunda, LLC [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Replenish account balance                 $ 1,000,000    
Mortgages [Member] | Frederick, MD [Member]                      
Debt Instrument [Line Items]                      
Refinanced loan amount $ 23,500,000                    
Basis points, interest rate 2.75%                    
Fixed interest rate         5.55%            
Debt Instrument, Periodic Payment         $ 45,250            
Debt Instrument, Collateral Amount         14,992,000            
Monthly principal payment amount         $ 43,250            
Mortgages [Member] | Rockaway, NJ Mortgage [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         5.37%            
Debt Instrument, Periodic Payment         $ 115,850            
Debt Instrument, Collateral Amount         $ 15,919,000            
Mortgages [Member] | Westwood, NJ #2 [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         4.75%            
Debt Instrument, Periodic Payment         $ 129,702            
Debt Instrument, Collateral Amount         7,612,000            
Loan amount         $ 22,750,000            
Mortgages [Member] | Patchogue, NY [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         4.50%            
Debt Instrument, Periodic Payment         $ 31,046            
Debt Instrument, Collateral Amount         $ 6,492,000            
Loan To Value         75.00%            
Mortgages [Member] | Wayne, NJ Mortgage 1 [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         6.09%            
Debt Instrument, Periodic Payment         $ 121,100            
Debt Instrument, Collateral Amount         $ 1,705,000            
Mortgages [Member] | River Edge, NJ Refinanced Mortgage [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         4.54%            
Debt Instrument, Periodic Payment         $ 57,456            
Debt Instrument, Collateral Amount         828,000            
Loan amount         $ 11,200,000            
Mortgages [Member] | Refinanced Maywood, NJ Mortgage [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         4.54%            
Debt Instrument, Periodic Payment         $ 43,605            
Loan amount         8,500,000            
Mortgage prepayment penalty         1,100,000            
Net proceeds from sale of property         $ 8,000,000            
Mortgages [Member] | Westwood, NJ #3 [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         4.62%            
Debt Instrument, Periodic Payment         $ 120,752            
Debt Instrument, Collateral Amount         9,515,000            
Mortgages [Member] | People's United Bank [Member]                      
Debt Instrument [Line Items]                      
Refinanced loan amount         $ 25,800,000            
Basis points, interest rate         2.20%            
Maturity date of loan         Oct. 01, 2026            
Mortgages [Member] | Second Wayne, NJ Mortgage [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         6.04%            
Debt Instrument, Collateral Amount         $ 25,579,000            
Mortgages [Member] | Second Wayne, NJ Mortgage [Member] | Construction in Progress [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Collateral Amount         $ 100,000            
Mortgages [Member] | Hackensack, NJ [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         5.38%            
Debt Instrument, Periodic Payment         $ 191,197            
Debt Instrument, Collateral Amount         $ 38,818,000            
Mortgages [Member] | Hackensack, NJ [Member] | Pierre Towers, LLC [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate         3.88%            
Loan amount         $ 48,000,000            
Amount drawn on loan         $ 960,000            
Term of the loan         5 years            
Net proceeds from refinancing of debt         $ 17,000,000            
Mortgage prepayment penalty         $ 1,200,000            
Mortgages [Member] | Damascus, MD [Member]                      
Debt Instrument [Line Items]                      
Basis points, interest rate         2.10%            
Fixed interest rate         3.81%            
Debt Instrument, Collateral Amount         $ 27,290,000            
Amount drawn on loan         $ 20,000,000 20,000,000          
Maturity date of loan         Jan. 03, 2023            
Line of credit, remaining capacity         $ 1,850,000            
People's United Bank [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate                   3.53%  
Loan amount     $ 25,800,000                
Amount drawn on loan         $ 20,400,000         $ 2,320,000  
People's United Bank [Member] | Readily Available [Member]                      
Debt Instrument [Line Items]                      
Amount drawn on loan                   $ 470,000  
People's United Bank [Member] | Baltimore, MD [Member]                      
Debt Instrument [Line Items]                      
Basis points, interest rate         2.25%            
Term of the loan         4 years            
Notes Payable, Other Payables [Member]                      
Debt Instrument [Line Items]                      
Amount drawn on loan         $ 141,678,000 113,967,000          
Notes Payable, Other Payables [Member] | Baltimore, MD [Member]                      
Debt Instrument [Line Items]                      
Basis points, interest rate       2.25% 2.50%            
Fixed interest rate         4.00%            
Debt Instrument, Collateral Amount       $ 19,500,000 $ 156,347,000            
Loan amount       $ 22,500,000              
Amount drawn on loan         115,300,000 113,967,000   $ 2,100,000      
Construction and pre-development costs         96,300,000            
Line of credit         800,000            
Repayments of debt to affiliate         19,000,000            
Notes Payable, Other Payables [Member] | Baltimore, MD [Member] | Fiscal Year [Member]                      
Debt Instrument [Line Items]                      
Amount drawn on loan         1,300,000            
Notes Payable, Other Payables [Member] | Baltimore, MD [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Amount drawn on loan         116,100,000            
Notes Payable, Other Payables [Member] | Baltimore, MD [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Amount drawn on loan         120,000,000            
Notes Payable, Other Payables [Member] | Frederick, MD [Member]                      
Debt Instrument [Line Items]                      
Amount drawn on loan         $ 23,241,000          
Provident Bank [Member]                      
Debt Instrument [Line Items]                      
Basis points, interest rate         1.25%            
Fixed interest rate         3.75%            
Debt Instrument, Collateral Amount         $ 3,100,000            
Loan amount         $ 16,200,000            
Amount drawn on loan                    
Maturity date of loan         Oct. 27, 2020            
Term of the loan         3 years            
Line of credit, maximum borrowing capacity         $ 13,000,000            
Line of credit, current borrowing capacity         12,800,000            
Line of credit, remaining capacity         9,900,000            
Line of credit, renewal         $ 1,100,000            
Provident Bank [Member] | Middletown, NY Mortgage [Member]                      
Debt Instrument [Line Items]                      
Basis points, interest rate         1.25%            
Fixed interest rate         3.75%            
Debt Instrument, Collateral Amount         $ 19,655,000            
Loan amount         $ 16,200,000            
Maturity date of loan         Dec. 15, 2024            
Annual interest costs         3.75%            
Monthly principal payment amount         $ 27,807            
[1] Includes $4,213 that was incurred and accrued in fiscal 2015; paid in fiscal 2016.
[2] Includes $5,523 that was incurred and accrued in fiscal 2014; paid in fiscal 2015.