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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 29, 2013
Dec. 30, 2012
Sep. 30, 2012
Allowance for doubtful accounts $ 1,553 $ 1,490 $ 1,533
Common Stock [Member]
      
Common stock, par value $ 1.00 $ 1.00 $ 1.00
Common stock, shares authorized 30,000,000 30,000,000 30,000,000
Common stock, shares issued 10,203,821 10,203,821 10,203,821
Treasury stock, shares 3,062,374 3,062,374 3,062,374
Class B Common Stock [Member]
      
Common stock, par value $ 1.00 $ 1.00 $ 1.00
Common stock, shares authorized 10,000,000 10,000,000 10,000,000
Common stock, shares issued 2,737,076 2,716,956 2,716,956
Treasury stock, shares 628,114 628,114 628,114