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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Cash dividends per common share (in dollars per share) | $ 0.22 | $ 0.18
Retained Earnings [Member] |  |
Cash dividends per common share (in dollars per share) | $ 0.22 | $ 0.18
Common Stock [Member] |  |
Employee stock purchase plan (in shares) | 426 | 338
Dividend reinvestment plan (in shares) | 4,624 | 35,319
Stock option exercises (in shares) | 7,000 | 20,000
Stock grants to directors (in shares) |  | 62

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