Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Summary of changes in shareholders' equity        
Beginning of Period     $ 102,863  
Beginning of Period, Shares     9,502,279  
Stock Compensation Expense     723 537
Foreign Currency Translation Adjustment (117) (1) (7) 203
Mark to Market Adjustment for Derivatives 27 (13) 50 37
Retirement Liability Adjustment (140) (22) 3,587 (45)
Net Income 5,194 4,548 11,289 9,757
End of Period 111,626   111,626  
End of Period, shares 9,783,503   9,783,503  
Common Class B [Member]
        
Summary of changes in shareholders' equity        
Shares Authorized     5,000,000  
Share Par Value     $ 0.01  
Beginning of Period, Shares     2,844,434  
End of Period, shares 2,612,785   2,612,785  
Common Stock [Member]
        
Summary of changes in shareholders' equity        
Shares Authorized     20,000,000  
Share Par Value     $ 0.01  
Beginning of Period     129  
Beginning of Period, Shares     9,680,825  
Conversion of Class B Shares to Common Shares     249,793  
Exercise of Stock Options Shares     31,431  
End of Period 129   129  
End of Period, shares 9,962,049   9,962,049  
Common Stock [Member] | Common Class B [Member]
        
Summary of changes in shareholders' equity        
Beginning of Period, Shares     3,194,229  
Conversion of Class B Shares to Common Shares     (249,793)  
Exercise of Stock Options Shares     18,144  
End of Period, shares 2,962,580   2,962,580  
Additional Paid-in Capital [Member]
        
Summary of changes in shareholders' equity        
Beginning of Period     19,279  
Stock Compensation Expense     723  
Exercise of Stock Options Value     295  
End of Period 20,297   20,297  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Summary of changes in shareholders' equity        
Beginning of Period     (886)  
Foreign Currency Translation Adjustment     (7)  
Mark to Market Adjustment for Derivatives     50  
Retirement Liability Adjustment     (3,587)  
End of Period (4,430)   (4,430)  
Retained Earnings [Member]
        
Summary of changes in shareholders' equity        
Beginning of Period     86,622  
Net Income     11,289  
End of Period 97,911   97,911  
Treasury Stock [Member]
        
Summary of changes in shareholders' equity        
Beginning of Period     (2,281)  
Beginning of Period, Shares     (178,546)  
Purchase (disposal) Value         
Purchase (disposal) Shares         
End of Period $ (2,281)   $ (2,281)  
End of Period, shares (178,546)   (178,546)  
Treasury Stock [Member] | Common Class B [Member]
        
Summary of changes in shareholders' equity        
Beginning of Period, Shares     (349,795)  
Purchase (disposal) Shares         
End of Period, shares (349,795)   (349,795)