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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Retained Earnings [Member] |  |  |  |
Cash dividends (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.93 | $ 0.93
Cash dividends (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.93 | $ 0.93

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