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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Retained Earnings [Member] |  |  |  |
Cash dividends per share (in dollars per share) | $ 0.15 | $ 0.14 | $ 0.30 | $ 0.28
Treasury acquired, shares (in shares) |  | 35,494 | 58,200 | 35,494

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