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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock issued to directors, shares (in shares) | 207,000 | 391,000 | 253,000
Common stock issued for cash, shares (in shares) |  |  | 21,410,000
Common stock issued for 401(k) match, shares (in shares) | 685,000 | 1,584,000 | 1,882,000
Common stock issued for prepayment of debt , shares (in shares) |  |  | 10,655,000
Common stock dividends declared, per common share (in dollars per share) | $ 0.0375 | $ 0.01625 | $ 0.01
Preferred stock dividends declared, per share (in dollars per share) | $ 2.63 | $ 2.63 | $ 2.63
Common stock issued for employee incentive compensation, shares (in shares) |  | 2,800,000 | 3,597,000
Common stock issued to pension plans, shares (in shares) | 4,500,000 | 2,869,000 | 2,384,000
Restricted stock unit distributions, shares (in shares) | 1,653,000 | 1,702,000 | 1,164,000
Treasury shares issued to charitable foundation, shares (in shares) |  | 650,000 |

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