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Condensed Statements of Shareholder's Equity Condensed Statements of Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Cash Dividends per Common Share $ 0.33 $ 0.32 $ 0.32 $ 0.32 $ 0.31 $ 0.31