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Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 3 Months Ended
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Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020
Dividends on common share (in dollars per share) | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21
Common Stock [Member] |  |  |  |  |  |
Common shares released from Employee Benefit Trust, shares (in shares) | 5,493 | 6,445 | 5,682 | 5,015 | 10,956 | 116,414
Restricted stock unit awards vested, shares (in shares) |  | 10,932 | 248,896 | 9,284 | 6,390 | 272,946
Treasury Stock [Member] |  |  |  |  |  |
Purchase of treasury shares (in shares) | 285,643 |  |  | 40,000 |  | 142,405
Repurchase of shares to satisfy tax obligation, shares (in shares) |  | 3,886 | 70,292 | 0 | 2,558 | 74,145

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