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Note 12 - Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Net income (numerator) |  | $ | 174,613 |  |  | $ | 174,539 |  |  | $ | 93,223 |
Weighted average shares (denominator) |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 68,538,248 |  |  |  | 68,081,632 |  |  |  | 67,360,632 |
Dilutive effect of stock compensation awards (1) |  |  | 1,632,796 |  |  |  | 1,585,897 |  |  |  | 1,832,506 |
Diluted |  |  | 70,171,044 |  |  |  | 69,667,529 |  |  |  | 69,193,138 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.55 |  |  | $ | 2.56 |  |  | $ | 1.38 |
Diluted |  | $ | 2.49 |  |  | $ | 2.51 |  |  | $ | 1.35 |

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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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