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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Common Stock    
Common Stock, shares authorized 25,000,000 25,000,000
Common Stock, par value (in dollars per share) $ 1 $ 1
Common Stock, shares issued 6,072,588 6,052,209
Common Stock, shares outstanding 5,386,623 5,436,952
Treasury Stock    
Treasury Stock, shares held 685,965 615,257