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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Retained Earnings [Member] |  |
Common dividends declared, per share (in dollars per share) | $ 0.66 | $ 0.16
Additional Paid-in Capital [Member] |  |
Common stock options exercised, shares (in shares) | 1,697 | 1,500
Treasury Stock [Member] |  |
Issuance of treasury stock to 401(k) plan, shares (in shares) | 4,943 | 5,243
Purchase of treasury shares, shares (in shares) | 187,300 | 6,800
Purchase of treasury shares, per share (in dollars per share) | $ 28.87 | $ 24.07
Common dividends declared, per share (in dollars per share) | $ 0.66 | $ 0.16

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