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CONDENSED BALANCE SHEETS (Parentheticals) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Treasury stock, shares 4,299,434 4,299,434
Nonvoting Common Stock
    
Common stock, par value (in dollars per share) 1 1
Common stock, shares authorized 50,000 50,000
Common stock, shares issued      
Voting Common Stock
    
Common stock, par value (in dollars per share) 1 1
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