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Note 7 - Revenue (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 20, 2026
Income Taxes Paid in Kind with Oil |  | $ 26,257 | $ 20,103 | $ 8,738 |
Taxes Payable, Current, Total | $ 0 | $ 0 | 3,128 |  |
Recovery Cost Assigned, Percent |  | 100.00% |  |  |
Minimum [Member] |  |  |  |  |
Recovery Cost Assigned, Percent |  | 5.00% |  |  |
Cost of Oil, Percent |  | 25.00% |  |  |
Allocation of Profit, Percent |  | 67.00% |  |  |
Maximum [Member] |  |  |  |  |
Recovery Cost Assigned, Percent |  | 15.00% |  |  |
Cost of Oil, Percent |  | 40.00% |  |  |
Allocation of Profit, Percent |  | 84.00% |  |  |
Egyptian General Petroleum Corporation (EGPC), Merged Concession Agreement [Member] |  |  |  |  |
Ownership Percentage | 50.00% | 50.00% |  |  |
Egyptian General Petroleum Corporation (EGPC), South Ghazalat Concession Agreement [Member] |  |  |  |  |
Ownership Percentage | 50.00% | 50.00% |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Foreign Tax Authority [Member] | Tax Administration of Gabon [Member] |  |  |  |  |
Income Taxes Paid in Kind with Oil | $ 26,300 |  |  |  |
Income Taxes Receivable | $ 2,800 | $ 2,800 |  |  |
Taxes Payable, Current, Total |  |  | $ 3,100 |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] |  |  |  |  |
Working Interest Ownership, Percentage | 7.50% | 7.50% |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] | Forecast [Member] |  |  |  |  |
Working Interest Ownership, Percentage |  |  |  |  | 10.00%
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Government of Gabon [Member] |  |  |  |  |
Monthly Royalty Rate, Based on Production at the Published Price | 13.00% | 13.00% |  |  |

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