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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Additional Paid-in Capital [Member] |  |  |
Common shares released from Employee Benefit Trust, shares (in shares) | 118,371 | 142,065 | 147,616
Restricted stock unit awards vested, shares (in shares) | 284,595 | 245,311 | 204,310
Exercise of stock options, shares (in shares) | 4,400 | 103,530 | 45,785
Common shares released from Employee Benefit Trust, shares (in shares) | 118,371 | 142,065 | 147,616
Restricted stock unit awards vested, shares (in shares) | 284,595 | 245,311 | 204,310
Exercise of stock options, shares (in shares) | 4,400 | 103,530 | 45,785
Treasury Stock [Member] | Shares Purchased to Fund Options Exercised [Member] |  |  |
Purchase of treasury shares (in shares) | 241,625 | 403,695 | 735,599
Purchase of treasury shares (in shares) | 241,625 | 403,695 | 735,599
Treasury Stock [Member] | Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member] |  |  |
Purchase of treasury shares (in shares) | 90,779 | 85,982 | 65,666
Purchase of treasury shares (in shares) | 90,779 | 85,982 | 65,666
Retained Earnings [Member] |  |  |
Dividends on common stock (in dollars per share) | $ 0.72 | $ 0.68 | $ 0.64
Dividends on common stock (in dollars per share) | $ 0.72 | $ 0.68 | $ 0.64
Exercise of stock options, shares (in shares) | 4,400 |  |
Purchase of treasury shares (in shares) | 241,625 | 403,695 |
Purchase of treasury shares (in shares) | 241,625 | 403,695 |
Exercise of stock options, shares (in shares) | 4,400 |  |

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