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Debt (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Jan. 02, 2010
Nov. 13, 2009
Nov. 02, 2006
Dec. 29, 2012
Minimum [Member]
Jan. 25, 2012
Revolving Credit Loan [Member]
Nov. 13, 2009
Revolving Credit Loan [Member]
Jun. 19, 2009
Revolving Credit Loan [Member]
Apr. 21, 2009
Revolving Credit Loan [Member]
Sep. 22, 2006
Revolving Credit Loan [Member]
Dec. 29, 2012
Revolving Credit Loan [Member]
Dec. 31, 2011
Revolving Credit Loan [Member]
Jan. 02, 2010
Revolving Credit Loan [Member]
Jan. 29, 2010
Revolving Credit Loan [Member]
Sep. 22, 2006
Revolving Credit Loan [Member]
Minimum [Member]
Apr. 21, 2009
Revolving Credit Loan [Member]
Minimum [Member]
Sep. 22, 2006
Revolving Credit Loan [Member]
Maximum [Member]
Apr. 21, 2009
Revolving Credit Loan [Member]
Maximum [Member]
Dec. 29, 2012
Loan Agreement [Member]
Sep. 22, 2006
2006 Term Loan [Member]
Jan. 29, 2010
Term Loan [Member]
Dec. 29, 2012
Term Loan [Member]
Jan. 25, 2012
2012 Term Loan Member]
Dec. 29, 2012
2012 Term Loan Member]
Apr. 21, 2009
Prior Loan Agreement [Member]
Minimum [Member]
Apr. 21, 2009
Prior Loan Agreement [Member]
Maximum [Member]
Debt Instrument [Line Items]                                                        
Maximum borrowing capacity                 $ 3,000,000   $ 3,000,000 $ 12,000,000       $ 10,000,000           $ 20,000,000 $ 5,000,000   $ 5,000,000      
Periodic payment of loan                                           714,286 178,571   178,571      
Term of loan                                           7 years 7 years   7 years      
Maturity date of loan                       Sep. 22, 2009                   Sep. 22, 2013 Jan. 31, 2017   Jan. 31, 2019      
Revolving credit portion commitment fee (in hundredths)                   0.50%             0.10%   0.25%       0.25%          
Description of variable rate basis               LIBOR rate or People's Prime rate     LIBOR   LIBOR LIBOR rate or People's Prime rate                            
Basis spread on variable rate (in hundredths)               2.25% 2.25% 2.25%     2.25%         1.00%   1.60%             1.00% 1.65%
Fixed rate of interest (in hundredths)                                               4.98%   3.90%    
Floor rate of loan (in hundredths)               3.25%         4.00%                              
Unused line fee (in hundredths)                             0.50%                          
Fixed charge coverage ratio as multiple, minimum                 1.1                       1.1              
Leverage coverage ratio as multiple maximum                                         1.75              
Consolidated cash balance required following dividend payments         10,000,000                                              
Interest rate swap contract [Abstract]                                                        
Notional amount           20,000,000                                            
Notional amount, percentage of term loan outstanding (in hundredths)           100.00%                                            
Fixed interest rate on swap contract (in hundredths)           5.25%                                            
Floor interest rate (in hundredths)           5.25%                                            
Termination interest rate swap contract       967,350                                                
Extinguishment of debt     10,714,286                                                  
Proceeds from line of credit used to fund discretionary pension payment 0 3,000,000 0                                                  
Schedule of debt [Abstract]                                                        
Long term debt 7,499,999 3,750,000                                                    
Revolving credit loan 0 3,000,000                                                    
Total debt 7,499,999 6,750,000                                                    
Less current portion 1,428,571 3,714,286                                                    
Long term debt, less current portion 6,071,428 3,035,714                                                    
Interest paid 349,972 240,635   317,269                                                
Tangible net worth 48,500,000 45,800,000         43,000,000                                          
Tangible net worth (in hundredths) 50.00%                                                      
Scheduled annual principal maturities of long-term debt [Abstract]                                                        
2013 1,428,571                                                      
2014 1,785,714                                                      
2015 1,071,429                                                      
2016 1,428,571                                                      
2017 892,857                                                      
Thereafter 892,857                                                      
Long term debt $ 7,499,999 $ 3,750,000