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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock [Member] |  |  |
Common shares released from Employee Benefit Trust, shares (in shares) | 129,601 | 118,371 | 142,065
Restricted stock unit awards vested, shares (in shares) | 258,567 | 284,595 | 245,311
Exercise of stock options, shares (in shares) | 900 | 4,400 | 103,530
Treasury Stock [Member] |  |  |
Purchase of treasury shares (in shares) | 787,069 | 241,625 | 403,695
Repurchase of shares to satisfy tax obligation, shares (in shares) | 76,698 | 90,779 | 85,982
Retained Earnings [Member] |  |  |
Dividends on common stock (in dollars per share) | $ 0.80 | $ 0.72 | $ 0.68
Purchase of treasury shares (in shares) | 787,069 | 241,625 |

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