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Note 3 - Net Income (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The calculation of basic and diluted net income (loss) per share is as follows.
Net income (loss) per share
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands, except per-share amounts) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Net income (loss)—basic and diluted |  | $ | 155,206 |  |  | $ | (29,951) |  |  | $ | 280,814 |  |  | $ | 110,510 |
Average common shares outstanding—basic |  | 193,436 |  |  | 193,299 |  |  | 193,692 |  |  | 197,545 |
Dilutive effect of share-based compensation arrangements (1) |  | 1,202 |  |  | — |  |  | 1,294 |  |  | 1,201 |
Adjusted average common shares outstanding—diluted |  | 194,638 |  |  | 193,299 |  |  | 194,986 |  |  | 198,746 |
Net income (loss) per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.80 |  |  | $ | (0.15) |  |  | $ | 1.45 |  |  | $ | 0.56 |
Diluted |  | $ | 0.80 |  |  | $ | (0.15) |  |  | $ | 1.44 |  |  | $ | 0.56 |
(1)There were no dilutive shares for the three months ended June 30, 2020, as a result of our net loss for the period. 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 (loss) per share because they are anti-dilutive.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Shares of common stock equivalents |  | — |  |  | 2,295 |  |  | — |  |  | 1,213 |

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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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