Note 6 - Revenue (Details Textual) - Foreign Tax Authority [Member] - Tax Administration of Gabon [Member] - USD ($) $ in Millions |
Sep. 30, 2023 |
Dec. 31, 2022 |
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| Accrued Income Taxes | $ 29.2 | |
| Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | ||
| Income Taxes Receivable | $ 2.8 |
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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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