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Consolidated Balance Sheets (Parentheticals) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Shareholders' Equity    
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, par value (in dollars per share) $ 5 $ 5
Common stock, shares outstanding (in shares) 41,539,984 41,469,879