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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Common Stock Including Additional Paid in Capital [Member] |  |  |  |
Employee stock purchase plan (in shares) | 404 | 692 | 1,106 | 1,821
Dividend reinvestment plan (in shares) | 7,904 | 10,327 | 20,814 | 27,707
Stock option exercises (in shares) | 2,000 |  | 2,000 |
Share repurchase program (in shares) | 288,863 |  | 635,773 | 222,385
Stock grants to directors (in shares) |  | 2,068 | 10,489 | 17,716
Retained Earnings [Member] |  |  |  |
Cash dividends per common share (in dollars per share) | $ 0.30 | $ 0.28 | $ 0.88 | $ 0.84
Cash dividends per common share (in dollars per share) | $ 0.30 | $ 0.28 | $ 0.88 | $ 0.84

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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
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