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Note 13 - Asset Retirement Obligations (Details Textual) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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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

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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126939881&loc=d3e61901-109447 + Details
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