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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common Stock [Member] | Stock Issued to Directors [Member] |  |  |
Stock issued to directors, shares (in shares) | 187,000 | 189,000 | 235,000
Common Stock [Member] | Stock Issued for 401(K) Match [Member] |  |  |
Stock issued for 401(k) match, shares (in shares) | 678,000 | 1,128,000 | 1,331,000
Common Stock [Member] |  |  |
Stock issued to directors, shares (in shares) | 533,000 | 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) | 1,251,000 | 1,390,000 | 896,000
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) | 1,829,000 | 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
Common stock issued for cash, shares (in shares) | 1,828,760 |  |

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