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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Retained Earnings [Member] |  |
Common dividends declared, per share (in dollars per share) | $ 0.16 | $ 0.14
Additional Paid-in Capital [Member] |  |
Restricted stock awards, shares (in shares) | 19,034 | 12,882
Common stock options exercised, shares (in shares) | 1,500 |
Treasury Stock [Member] |  |
Issuance of treasury stock to 401(k) plan, shares (in shares) | 5,243 | 7,727
Purchase of treasury shares, shares (in shares) | 6,800 | 487,739
Purchase of treasury shares, per share (in dollars per share) | $ 24.07 | $ 18.14
Common dividends declared, per share (in dollars per share) | $ 0.16 | $ 0.14

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