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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retained Earnings [Member] |  |  |
Common dividends declared, per share (in dollars per share) | $ 0.78 | $ 0.68 | $ 0.60
Special common dividends declared, per share (in dollars per share) | $ 0.48 |  |
Treasury Stock [Member] |  |  |
Common stock options exercised, shares (in shares) | 24,186 | 16,185 | 43,463
Issuance of treasury stock to 401(k) plan, shares (in shares) | 11,331 | 15,254 | 18,218
Purchase of treasury shares, shares (in shares) | 1,060,312 | 50,118 | 1,182,294
Purchase of treasury shares, per share (in dollars per share) | $ 32.45 | $ 25.16 | $ 20.06
Common dividends declared, per share (in dollars per share) | $ 1.26 | $ 0.68 | $ 0.60
Common stock options exercised, shares (in shares) | 24,186 |  |

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