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Note 9 - Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Numerator- net income |  | $ | 36,497 |  |  | $ | 47,093 |  |  | $ | 125,223 |  |  | $ | 126,021 |
Denominator- weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 68,556,051 |  |  |  | 68,198,006 |  |  |  | 68,511,409 |  |  |  | 68,026,705 |
Dilutive effect of stock compensation awards (1) |  |  | 1,477,173 |  |  |  | 1,689,019 |  |  |  | 1,539,544 |  |  |  | 1,600,510 |
Diluted |  |  | 70,033,224 |  |  |  | 69,887,025 |  |  |  | 70,050,953 |  |  |  | 69,627,215 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.53 |  |  | $ | 0.69 |  |  | $ | 1.83 |  |  | $ | 1.85 |
Diluted |  | $ | 0.52 |  |  | $ | 0.67 |  |  | $ | 1.79 |  |  | $ | 1.81 |

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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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