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Note 4 - Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
(Dollars in thousands, except share and per share data) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Net income |  | $ | 45,200 |  |  | $ | 35,084 |  |  | $ | 81,180 |  |  | $ | 66,343 |
Weighted-average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 79,939,197 |  |  |  | 79,642,993 |  |  |  | 79,887,699 |  |  |  | 79,619,506 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  | 566,405 |  |  |  | 273,759 |  |  |  | 456,274 |  |  |  | 286,079 |
Options |  |  | 139,867 |  |  |  | 97,476 |  |  |  | 124,249 |  |  |  | 99,575 |
Restricted stock units |  |  | 53,525 |  |  |  | 32,243 |  |  |  | 37,043 |  |  |  | 37,786 |
Diluted weighted-average number of common shares outstanding |  |  | 80,698,994 |  |  |  | 80,046,471 |  |  |  | 80,505,265 |  |  |  | 80,042,946 |
Average stock options and warrants with anti-dilutive effect |  |  | 939,615 |  |  |  | 2,003,896 |  |  |  | 1,246,123 |  |  |  | 1,994,922 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.57 |  |  | $ | 0.44 |  |  | $ | 1.02 |  |  | $ | 0.83 |
Diluted |  | $ | 0.56 |  |  | $ | 0.44 |  |  | $ | 1.01 |  |  | $ | 0.83 |

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- References No definition available. + Details
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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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