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Long-Term Debt (Details) (USD $)
9 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 9 Months Ended
Aug. 31, 2013
Dec. 01, 2012
Aug. 31, 2013
Interest rate swap agreement
item
Sep. 01, 2012
Interest rate swap agreement
Aug. 31, 2013
Nonrecourse mortgages
Dec. 01, 2012
Nonrecourse mortgages
Aug. 31, 2013
Nonrecourse mortgages: 6.30%, due May 1, 2014
Dec. 01, 2012
Nonrecourse mortgages: 6.30%, due May 1, 2014
Aug. 31, 2013
Nonrecourse mortgages: 5.73%, due August 1, 2015
Dec. 01, 2012
Nonrecourse mortgages: 5.73%, due August 1, 2015
Aug. 31, 2013
Nonrecourse mortgages: 8.13%, due April 1, 2016
Dec. 01, 2012
Nonrecourse mortgages: 8.13%, due April 1, 2016
Aug. 31, 2013
Nonrecourse mortgages: 7.0%, due October 2, 2017
Dec. 01, 2012
Nonrecourse mortgages: 7.0%, due October 2, 2017
Aug. 31, 2013
Nonrecourse variable rate mortgage, due October 2, 2017
Dec. 01, 2012
Nonrecourse variable rate mortgage, due October 2, 2017
Aug. 31, 2013
Nonrecourse variable rate mortgage, due February 1, 2019
Dec. 01, 2012
Nonrecourse variable rate mortgage, due February 1, 2019
Aug. 31, 2013
Nonrecourse variable rate mortgage, due August 1, 2019
Dec. 01, 2012
Nonrecourse variable rate mortgage, due August 1, 2019
Apr. 01, 2013
Nonrecourse Variable rate mortgage, due January 27, 2020
Aug. 31, 2013
Nonrecourse Variable rate mortgage, due January 27, 2020
Dec. 01, 2012
Nonrecourse Variable rate mortgage, due January 27, 2020
Apr. 01, 2013
Nonrecourse Variable rate mortgage, due January 27, 2020
Interest rate swap agreement
Aug. 28, 2013
Nonrecourse Variable rate mortgage, due September 1, 2023
Aug. 31, 2013
Nonrecourse Variable rate mortgage, due September 1, 2023
Aug. 28, 2013
Nonrecourse Variable rate mortgage, due September 1, 2023
Industrial building in Lower Nazareth, Pennsylvania
sqft
Apr. 01, 2013
Nonrecourse mortgages: 5.25%, due January 27, 2020
Apr. 24, 2013
Webster Credit Line
Aug. 31, 2013
Webster Credit Line
Apr. 24, 2013
Webster Credit Line
Griffin Center South, Bloomfield, CT
sqft
Apr. 24, 2013
Webster Credit Line
Single-story office building in Griffin Center
sqft
Aug. 31, 2013
Doral Credit Line
Sep. 01, 2012
Doral Credit Line
Aug. 31, 2013
Capital leases
Dec. 01, 2012
Capital leases
Aug. 28, 2013
2023 First Niagara Mortgage
Interest rate swap agreement
Long-Term Debt                                                                          
Interest rate (as a percent)             6.30% 6.30% 5.73% 5.73% 8.13% 8.13% 7.00% 7.00%                           5.25%                  
Total $ 67,307,000 $ 59,561,000     $ 67,213,000 $ 59,489,000 $ 148,000 $ 289,000 $ 18,718,000 $ 19,018,000 $ 3,690,000 $ 3,943,000 $ 5,840,000 $ 6,016,000 $ 6,604,000 $ 6,726,000 $ 11,213,000 $ 11,396,000 $ 7,911,000 $ 8,034,000   $ 3,989,000 $ 4,067,000     $ 9,100,000                 $ 94,000 $ 72,000  
Less: current portion (2,104,000) (1,869,000)                                                                      
Total long-term debt 65,203,000 57,692,000                                                                      
Debt disclosures                                                                          
Ineffectiveness on cash flow hedges 0                                                                        
Anticipated ineffectiveness on cash flow hedges 0                                                                        
Number of agreements containing credit risk related contingent features     0                                                                    
Recognized gains (losses) (included in other comprehensive income), before taxes, on interest rate swap agreements     990,000 1,276,000                                                                  
Loss expected to be reclassified over next twelve months from accumulated other comprehensive loss to interest expense 965,000                                                                        
Liability for interest rate swap agreements included in other noncurrent liabilities 1,642,000                                                                        
Maximum borrowing capacity                                                         12,500,000                
Term of debt                                                 10 years       2 years                
Variable interest rate base                                         one month LIBOR       one month LIBOR       one month LIBOR       prime rate        
Variable interest rate margin (as a percent)                                         2.50%       1.95%       2.75%       1.50%        
Variable interest rate percentage, option                                                                 5.875%        
Amount paid for the loan modification 70,000                                       70,000                                
Minimum percentage of difference required between the present values of the future payments under the existing loan and the modified loan                                         10.00%                                
Deferred costs related to the existing loan with First Niagara Bank                                         216,000                                
Fixed interest rate for the final nine years of the loan pursuant to interest rate swap agreement (as a percent)                                               3.91%                         4.79%
Area of collateralized properties (in square feet)                                                     228,000       235,000 48,000          
Borrowings under credit line                                                           0     0 0      
Borrowings by subsidiary                                                 9,100,000                        
Lease term of existing full building tenant 5 years                                                                        
Amortization period of debt                                                 25 years                        
Notional principal amount of interest rate swap agreement                                                                         $ 9,100,000