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Note 6 - Revenue (Details Textual) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 20, 2026 | Dec. 31, 2022
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% |  |
Egyptian General Petroleum Corporation (EGPC), South Ghazalat Concession Agreement [Member] |  |  |
Ownership Percentage | 50.00% |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Foreign Tax Authority [Member] | Tax Administration of Gabon [Member] |  |  |
Income Taxes Receivable | $ 16.7 |  | $ 2.8
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% |  |
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% |  |

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