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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Common Stock [Member] | Stock Issued to Directors [Member] |  |  |
Stock issued to directors, shares (in shares) | 189,000 | 235,000 | 150,000
Common Stock [Member] | Stock Issued for 401(K) Match [Member] |  |  |
Stock issued for 401(k) match, shares (in shares) | 1,128,000 | 1,331,000 | 811,000
Common Stock [Member] |  |  |
Stock issued to directors, shares (in shares) | 2,185,000 | 871,000 |
Stock issued for 401(k) match, shares (in shares) | 1,827,000 | 1,764,000 |
Restricted stock unit distributions, shares (in shares) | 1,390,000 | 896,000 | 2,674,000
Warrants exercised, shares (in shares) |  |  | 22,308,000
Common stock issued for purchase of another company, shares (in shares) | 8,852,000 | 6,253,000 |
Common stock issued for cash, shares (in shares) | 2,780,000 |  |
Retained Earnings [Member] |  |  |
Common stock dividends declared, per common share (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01
Treasury Stock [Member] |  |  |
Repurchase of common shares, shares (in shares) |  | 284,000 | 534,000

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