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Note 4 - Acquisition and Dispositions - Unaudited Proforma Results (Details) - Etame Marine Block [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Crude oil and natural gas sales | $ 547,670 |  | $ 367,210 |
Operating income | 267,582 |  | 104,924 |
Net income | $ 130,425 | [1] | $ 54,534 | [2]
Income from continuing operations (in dollars per share) | $ 1.21 |  | $ 0.51 |
Loss from discontinued operations, net of tax (in dollars per share) | 0 |  | 0 |
Net income per share (in dollars per share) | $ 1.21 |  | $ 0.51 |
Basic weighted average shares outstanding (in shares) | 108,206 |  | 107,537 |
Income from continuing operations (in dollars per share) | $ 1.20 |  | $ 0.50 |
Loss from discontinued operations, net of tax (in dollars per share) | 0 |  | 0 |
Net income per share (in dollars per share) | $ 1.20 |  | $ 0.50 |
Diluted weighted average shares outstanding (in shares) | 108,642 |  | 108,062 |
[1] | The unaudited pro forma net income for the year ended December 31, 2021 excludes nonrecurring pro forma adjustments directly attributable to the Sasol Acquisition, consisting of a bargain purchase gain of $7.7 million and transaction costs of $1.0 million.
[2] | The unaudited pro forma net loss for the year ended December 31, 2020 includes nonrecurring pro forma adjustments directly attributable to the Sasol Acquisition, consisting of a bargain purchase gain of $7.7 million and transaction costs of $1.0 million.

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