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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Cash, Cash Equivalents and Restricted Cash [Table Text Block] |
|  | As of December 31, |
|  | 2023 |  |  | 2022 |
|  | (in thousands) |
Cash and cash equivalents |  | $ | 121,001 |  |  | $ | 37,205 |
Restricted cash - current |  |  | 114 |  |  |  | 222 |
Restricted cash - non-current |  |  | 1,795 |  |  |  | 1,763 |
Abandonment funding |  |  | 6,268 |  |  |  | 20,586 |
Total cash, cash equivalents and restricted cash |  | $ | 129,178 |  |  | $ | 59,776 |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Twelve Months Ended December 31, |
|  | 2023 |  |  | 2022 |
|  | (in thousands) |
Allowance for credit losses and other |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (8,704 | ) |  | $ | (5,741 | )
Credit losses and other |  |  | (7,543 | ) |  |  | (3,380 | )
Credit recoveries and other |  |  | 12,449 |  |  |  | 298 |
Adjustment associated with Sasol Acquisition |  |  | — |  |  |  | — |
Cumulative effect of adjustment upon adoption of ASU 2016-13 on January 1, 2023 |  |  | (3,120 | ) |  |  | — |
Foreign currency gain |  |  | 889 |  |  |  | 119 |
Balance at end of period |  | $ | (6,029 | ) |  | $ | (8,704 | )
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] |
|  | As of December 31, 2023 |  |  | As of December 31, 2022 |
|  | (in thousands) |
Prepaid fixed asset progress payments |  | $ | 2,314 |  |  | $ | 3,991 |
Gabon prepaid royalties |  |  | 1,246 |  |  |  | 4,800 |
Prepaid insurance |  |  | 474 |  |  |  | 117 |
Egypt advances to contractors |  |  | 2,656 |  |  |  | 4,914 |
Gabon employee loans and advances |  |  | 1,299 |  |  |  | 1,146 |
Refundable deposits |  |  | 345 |  |  |  | 623 |
Derivative receivables |  |  | 403 |  |  |  | 102 |
Other prepayments |  |  | 3,697 |  |  |  | 4,377 |
Total prepayments and other |  | $ | 12,434 |  |  | $ | 20,070 |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  |  | As of December 31, 2023 |
| Balance Sheet Line |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  |  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset | Prepayments and other |  | $ | — |  |  | $ | 403 |  |  | $ | — |  |  | $ | 403 |
|  |  | $ | — |  |  | $ | 403 |  |  | $ | — |  |  | $ | 403 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability | Accrued liabilities and other |  | $ | — |  |  | $ | 163 |  |  | $ | — |  |  | $ | 163 |
Derivative liability | Accrued liabilities and other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | $ | — |  |  | $ | 163 |  |  | $ | — |  |  | $ | 163 |
|  |  | As of December 31, 2022 |
| Balance Sheet Line |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  |  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset | Prepayments and other |  | $ | — |  |  | $ | 102 |  |  | $ | — |  |  | $ | 102 |
|  |  | $ | — |  |  | $ | 102 |  |  | $ | — |  |  | $ | 102 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability | Accrued liabilities and other |  | $ | — |  |  | $ | 556 |  |  | $ | — |  |  | $ | 556 |
|  |  | $ | — |  |  | $ | 556 |  |  | $ | — |  |  | $ | 556 |

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