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Note 4 - Earnings per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended March 31, |
(Dollars in thousands, except share and per share data) |  | 2015 |  |  | 2014 |
Net income |  | $ | 35,980 |  |  | $ | 31,259 |
Weighted-average shares: |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 79,835,628 |  |  |  | 79,595,757 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |
Warrants |  |  | 344,919 |  |  |  | 298,535 |
Options |  |  | 108,457 |  |  |  | 101,698 |
Restricted stock units |  |  | 20,379 |  |  |  | 43,392 |
Diluted weighted-average number of common shares outstanding |  |  | 80,309,383 |  |  |  | 80,039,382 |
Average stock options and warrants with anti-dilutive effect |  |  | 1,670,231 |  |  |  | 1,985,848 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.45 |  |  | $ | 0.39 |
Diluted |  | $ | 0.45 |  |  | $ | 0.39 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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