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Note 8 - Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2014
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, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Numerator- net income |  | $ | 54,025 |  |  | $ | 28,254 |  |  | $ | 88,726 |  |  | $ | 78,928 |
Denominator- weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 68,538,251 |  |  |  | 68,140,330 |  |  |  | 68,481,682 |  |  |  | 68,003,164 |
Dilutive effect of stock compensation awards (1) |  |  | 1,549,725 |  |  |  | 1,669,269 |  |  |  | 1,606,756 |  |  |  | 1,798,334 |
Diluted |  |  | 70,087,976 |  |  |  | 69,809,599 |  |  |  | 70,088,438 |  |  |  | 69,801,498 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.79 |  |  | $ | 0.41 |  |  | $ | 1.30 |  |  | $ | 1.16 |
Diluted |  | $ | 0.77 |  |  | $ | 0.40 |  |  | $ | 1.27 |  |  | $ | 1.13 |

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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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