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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Consolidated Balance Sheets    
Common stock, par value (in dollars per share) $ 4 $ 4
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 1,453,759 1,453,009
Common stock, shares outstanding (in shares) 1,453,759 1,453,009