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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock issued to directors, shares (in shares) | 391,000 | 253,000 | 162,000
Common stock issued for cash, shares (in shares) |  | 21,410,000 | 2,565,000
Stock issued for 401(k) match, shares (in shares) | 1,584,000 | 1,882,000 | 1,068,000
Common stock and warrants issued for purchase of another company, shares (in shares) |  |  | 75,276,000
Common stock dividends declared, per common share (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01
Common stock issued for employee incentive compensation,shares (in shares) | 2,800,000 | 3,597,000 | 1,237,000
Common stock issued to pension plans, shares (in shares) | 2,869,000 | 2,384,000 | 2,736,000
Restricted stock unit distributions, shares (in shares) | 1,702,000 | 1,164,000 | 1,079,000
Common stock issued for prepayment of debt, sahres (in shares) |  | 10,665,000 |
Treasury shares issued to charitable foundation, shares (in shares) | 650,000 |  |

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