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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 5,822,357 5,605,203
Treasury stock, shares 205,750 164,013