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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Common Stock Including Additional Paid in Capital [Member] |  |
Employee stock purchase plan (in shares) | 331 | 642
Dividend reinvestment plan (in shares) | 6,647 | 8,073
Share repurchase program (in shares) | 118,261 | 222,385
Retained Earnings [Member] |  |
Cash dividends per common share (in dollars per share) | $ 0.29 | $ 0.28
Cash dividends per common share (in dollars per share) | $ 0.29 | $ 0.28

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