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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retained Earnings [Member] |  |  |
Common dividends declared, per share (in dollars per share) | $ 0.96 | $ 0.78 | $ 0.68
Special common dividends declared, per share (in dollars per share) |  | $ 0.48 |
Treasury Stock [Member] |  |  |
Common stock options exercised, shares (in shares) | 8,459 | 24,186 | 16,185
Issuance of treasury stock to 401(k) plan, shares (in shares) | 12,407 | 11,331 | 15,254
Purchase of treasury shares, shares (in shares) |  | 1,060,312 | 50,118
Purchase of treasury shares, per share (in dollars per share) |  | $ 32.45 | $ 25.16
Purchase of treasury shares, shares (in shares) |  | 1,060,312 | 50,118
Purchase of treasury shares, per share (in dollars per share) |  | $ 32.45 | $ 25.16
Purchase of treasury shares, shares (in shares) | 487,400 |  |
Purchase of treasury shares, per share (in dollars per share) | $ 33.57 |  |
Common stock options exercised, shares (in shares) | 8,459 |  |

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