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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2020
Dec. 31, 2019
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 6,108,185 6,076,813
Common Stock, shares outstanding 4,713,261 4,770,454
Treasury Stock    
Treasury Stock, shares held 1,394,924 1,306,359