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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Retained Earnings [Member]        
Dividends, per share (in dollars per share) $ 2.85 $ 2.75 $ 8.35 $ 7.75