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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Common Stock [Member] |  |  |  |  |  |
Common shares released from Employee Benefit Trust (in shares) | 5,015 | 5,568 | 138,775 | 3,899 | 4,455 | 116,229
Restricted stock unit awards vested, shares (in shares) | 9,284 | 1,120 | 287,155 | 8,720 |  | 248,877
Exercise of stock options, shares (in shares) |  |  | 300 |  | 600 |
Restricted stock unit awards vested, shares (in shares) | 9,284 | 1,120 | 287,155 | 8,720 |  | 248,877
Treasury Stock [Member] |  |  |  |  |  |
Repurchase of shares to satisfy tax obligation, shares (in shares) | 0 | 382 | 83,908 | 3,343 | 32 | 72,837
Purchase of treasury shares (in shares) |  |  |  |  | 227,581 | 217,863
Retained Earnings [Member] |  |  |  |  |  |
Dividends on common stock (in dollars per share) | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.20 | $ 0.20 | $ 0.20
Purchase of treasury shares (in shares) | 40,000 |  |  |  |  |

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