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CONDENSED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 30, 2013
Dec. 31, 2012
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 23,618,934 23,562,422
Common Stock, shares outstanding 19,319,500 19,262,988