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CONDENSED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 28, 2014
Dec. 31, 2013
Treasury stock, shares 4,299,434 4,299,434
Nonvoting Common Stock [Member]
    
Common Stock, par value per share $ 1 $ 1
Common Stock, shares authorized 50,000 50,000
Common Stock, shares issued 0 0
Voting Common Stock [Member]
    
Common Stock, par value per share $ 1 $ 1
Common Stock, shares authorized 40,000,000 40,000,000
Common Stock, shares issued 23,716,369 23,647,350
Common Stock, shares outstanding 19,416,935 19,347,916