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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Additional Paid-in Capital [Member] |  |
Common shares released from Employee Benefit Trust, shares (in shares) | 111,470 | 134,005
Restricted stock unit awards vested, shares (in shares) | 258,165 | 245,111
Exercise of stock options, shares (in shares) | 4,400 | 27,945
Treasury Stock [Member] | Shares Purchased to Fund Options Exercised [Member] |  |
Purchase of treasury shares (in shares) | 10,000 | 378,695
Treasury Stock [Member] | Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member] |  |
Purchase of treasury shares (in shares) | 80,303 | 77,212
Retained Earnings [Member] |  |
Dividends on common stock (in dollars per share) | $ 0.36 | $ 0.34

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