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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Common Stock [Member] |  |
Employee stock purchase plan (in shares) | 1,169 | 1,053
Dividend reinvestment plan (in shares) | 14,015 | 43,938
Stock option exercises (in shares) | 8,800 | 25,075
Stock grants to directors (in shares) | 11,171 | 11,712
Retained Earnings [Member] |  |
Cash dividends per common share (in dollars per share) | $ 0.68 | $ 0.55
Cash dividends per common share (in dollars per share) | $ 0.68 | $ 0.55

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