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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 3 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019
Dividends on common stock (in dollars per share) | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21
Common Stock [Member] |  |  |  |
Common shares released from Employee Benefit Trust, shares (in shares) | (10,956) | (116,414) | 5,568 | 138,775
Restricted stock unit awards vested, shares (in shares) | (6,390) | (272,946) | 1,120 | 287,155
Exercise of stock options, shares (in shares) |  |  |  | 300
Treasury Stock [Member] |  |  |  |
Purchase of treasury shares (in shares) |  | (142,405) |  |
Repurchase of shares to satisfy tax obligation, shares (in shares) | (2,558) | (74,145) | 382 | 83,908

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