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CONDENSED BALANCE SHEETS (Parenthetical) (USD $)
Sep. 29, 2012
Dec. 31, 2011
Treasury stock, shares 4,299,434 4,299,434
Nonvoting Common Stock [Member]
    
Common Stock, par value per share 1.0 1.0
Common Stock, shares authorized 50,000 50,000
Common Stock, shares issued      
Voting Common Stock [Member]
    
Common Stock, par value per share 1.0 1.0
Common Stock, shares authorized 40,000,000 40,000,000
Common Stock, shares issued 23,459,506 23,382,566
Common Stock, shares outstanding 19,160,072 19,083,132