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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 19, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2023
Abandonment Funding Payment Approved |  | $ 26,600 |  |  |  |  |
Abandonment Funding Payment Approved, Attributable to Company |  | 15,600 |  |  |  |  |
Payment Received for Abandonment |  | $ 15,600 |  |  |  |  |
Allowance for Credit Loss, Receivable, Other, Current |  |  | $ 0 | $ 4,600 | $ 0 |  |
Value Added Tax Receivable |  |  | 13,900 | 1,600 | 13,900 |  |
Retained Earnings (Accumulated Deficit) |  |  | 147,024 | 177,486 | 147,024 |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  | (4,906) | 3,082 | $ 875 |
Gain (Loss), Foreign Currency Transaction, before Tax |  |  |  | (900) | (4,200) | $ (700) |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Other Receivables |  |  |  |  |  |  | $ 7,500
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | $ 3,100
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  | (12,400) |  |  |
Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] |  |  |  |  |  |  |
Value Added Tax Receivable |  |  | 21,800 |  | $ 21,800 |  |
Block P Offshore Equatorial Guinea [Member] |  |  |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss |  |  |  | 800 |  |  |
TransGlobe [Member] |  |  |  |  |  |  |
Merged Concession Agreement, Development Term (Year) | 15 years |  |  |  |  |  |
Merged Concession Agreement, Extension Term (Year) | 5 years |  |  |  |  |  |
Other Receivables | $ 67,500 |  |  | 45,600 |  |  |
Proceeds from Collection of Other Receivables |  |  | $ 17,200 |  |  |  |
Allowance for Credit Loss, Receivable, Other, Current |  |  |  | 4,600 |  |  |
FPSO Charter [Member] |  |  |  |  |  |  |
Restricted Cash |  |  |  | 1,800 |  |  |
CANADA |  |  |  |  |  |  |
Restricted Cash, Current |  |  |  | $ 100 |  |  |

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