Note 13 - Asset Retirement Obligations (Details Textual) - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Dec. 31, 2021 |
|
| Asset Retirement Obligation, Revision of Estimate | $ 0 | $ 7,169 | |
| Asset Retirement Obligation, Liabilities Incurred | 0 | $ 14,564 | 14,564 |
| Accrued Liabilities and Other [Member] | |||
| Capitalized Costs, Asset Retirement Costs | $ 6,800 | ||
| Sasol Gabon S.A. [Member] | |||
| Asset Retirement Obligation, Liabilities Incurred | $ 14,600 | ||
| X | ||||||||||
- Definition Amount of asset retirement obligations incurred during the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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