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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Common Stock Including Additional Paid in Capital [Member] |  |  |  |
Employee stock purchase plan (in shares) | 371 | 487 | 702 | 1,129
Dividend reinvestment plan (in shares) | 6,263 | 9,307 | 12,910 | 17,380
Stock grants to directors (in shares) | 10,489 | 15,648 | 10,489 | 15,648
Share repurchase program (in shares) | 228,649 |  | 346,910 | 222,385
Retained Earnings [Member] |  |  |  |
Cash dividends per common share (in dollars per share) | $ 0.29 | $ 0.28 | $ 0.58 | $ 0.56
Cash dividends per common share (in dollars per share) | $ 0.29 | $ 0.28 | $ 0.58 | $ 0.56

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