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Note 3 - Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
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.
|  |  |  |  | Three Months Ended March 31,
(In thousands, except per-share amounts) |  |  |  |  | 2021 |  | 2020
Net income—basic and diluted |  |  |  |  | $ | 125,608 |  |  | $ | 140,461 |
Average common shares outstanding—basic |  |  |  |  | 193,439 |  |  | 200,161 |
Dilutive effect of share-based compensation arrangements (1) |  |  |  |  | 1,764 |  |  | 1,658 |
Adjusted average common shares outstanding—diluted |  |  |  |  | 195,203 |  |  | 201,819 |
Net income per share: |  |  |  |  |  |  |
Basic |  |  |  |  | $ | 0.65 |  |  | $ | 0.70 |
Diluted |  |  |  |  | $ | 0.64 |  |  | $ | 0.70 |
(1)The following number of shares of our common stock equivalents issued under our share-based compensation arrangements are not included in the calculation of diluted net income per share because they are anti-dilutive.
|  |  |  |  | Three Months Ended March 31,
(In thousands) |  |  |  |  | 2021 |  | 2020
Shares of common stock equivalents |  |  |  |  | — |  |  | 132 |

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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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