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Balance Sheets (Parenthetical) (USD $)
Dec. 31, 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      
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 23,647,350 23,562,422
Common Stock, shares outstanding 19,347,916 19,262,988