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Note 3 - Net Income Per Share- Level 2 (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The calculation of basic and diluted net income per share is as follows.
|  | Year Ended December 31,
(In thousands, except per-share amounts) |  | 2020 |  | 2019 |  | 2018
Net income—basic and diluted |  | $ | 393,626 |  |  | $ | 672,309 |  |  | $ | 606,011 |
Average common shares outstanding—basic |  | 195,443 |  |  | 208,773 |  |  | 214,267 |
Dilutive effect of stock-based compensation arrangements (1) |  | 1,199 |  |  | 1,567 |  |  | 4,286 |
Adjusted average common shares outstanding—diluted |  | 196,642 |  |  | 210,340 |  |  | 218,553 |
Net income per share: |  |  |  |  |  |
Basic |  | $ | 2.01 |  |  | $ | 3.22 |  |  | $ | 2.83 |
Diluted |  | $ | 2.00 |  |  | $ | 3.20 |  |  | $ | 2.77 |
(1)The following number of shares of our common stock equivalents issued under our share-based compensation arrangements were not included in the calculation of diluted net income per share because they were anti-dilutive:
|  | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
Shares of common stock equivalents |  | 865 |  |  | 221 |  |  | 337 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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