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Note 9 - Crude Oil and Natural Gas Properties and Equipment (Details Textual) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 20, 2026 | Feb. 25, 2021 USD ($) | Sep. 26, 2018 USD ($) | Sep. 25, 2018 | Feb. 28, 2023 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 | Sep. 16, 2028 | Apr. 30, 2021 | Apr. 12, 2021 | Feb. 24, 2021 | Sep. 17, 2018 USD ($) | Dec. 31, 2012
Increase (Decrease) in Value Added Tax Receivable |  |  |  |  |  |  |  | $ 5,193 | $ 1,593 | $ 1,268 |  |  |  |  |  |  |
Impairment of Oil and Gas Properties |  |  |  |  |  |  |  | 0 | 0 | $ 30,625 |  |  |  |  |  |  |
Property, Plant and Equipment, Net, Total |  |  |  |  |  |  |  | 495,272 | 94,324 |  |  |  |  |  |  |  |
Deferred Tax Assets, Property, Plant and Equipment |  |  |  |  |  |  |  | 9,299 | $ 20,133 |  |  |  |  |  |  |  |
Block P Offshore Equatorial Guinea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.00%
Additional Ownership Interest Acquired |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |
Asset Acquisition, Percent Interest Acquired |  |  |  |  |  |  |  |  |  | 43.00% |  |  |  |  |  |  |
Asset Acquisition, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  |  |  |  | $ 3,100 |  |  |  |  |  |  |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working Interest Ownership, Percentage |  | 58.80% |  |  |  |  |  |  |  |  |  |  |  |  | 31.10% |  |
Unproved Oil and Gas Property, Successful Effort Method |  | $ 2,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TransGlobe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undeveloped Leasehold Value |  |  |  |  |  |  |  | $ 30,200 |  |  |  |  |  |  |  |  |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Working Interest Ownership Percentage |  | 27.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Oil and Gas Properties |  |  |  |  |  |  | $ 30,600 |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net, Total |  |  |  |  |  |  | 15,600 |  |  |  |  |  |  |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Costs of Technical Studies |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,600 |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Forecast [Member] | Etame Marine Block [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Working Interest Ownership Percentage | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Agreement for Exploitation Areas (Year) |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Entitled Percent for Consortium After Initial Royalty Percentage |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entitled Percent for Consortium After Initial Royalty Percentage |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |
Working Interest Ownership, Percentage | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Wells Drilled |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of Appraisal Wellbores Drilled |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of Technical Studies Required |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Estimated Costs of Technical Studies |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Signing Bonus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of Signing Bonus, Allocated to Proved and Unproved Property |  |  | $ 11,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Value Added Tax Receivable |  |  | 8,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Accrued Liabilities, Current |  |  | 1,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Costs, Unproved Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,700 |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Signing Bonus [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of Signing Bonus, Allocated to Proved and Unproved Property |  |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Value Added Tax Receivable |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Accrued Liabilities, Current |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Tax Effect [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Costs, Unproved Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,100 |
Production Sharing Contract After September 16, 2028 [Member] | Signing Bonus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,800 |
Production Sharing Contract After September 16, 2028 [Member] | Signing Bonus [Member] | Vaalco Energy Inc. and Other Etame Marin Block Owners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,000 |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Project, Ownership, Percent |  |  |  | 63.575% |  |  |  |  |  |  |  |  |  |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  |  |  |  | 2,300 |  |  |  |  |  |  |  |  |  |
Undeveloped Leasehold Value |  |  |  |  |  |  | $ 11,500 | $ 13,700 |  |  |  |  |  |  |  |  |
Etame Marine Block [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Exploitation Areas |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Agreement for Exploitation Areas (Year) |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Contract Extension Periods |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Production License Agreement Term Extended by Government (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Etame Marine Block [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Working Interest Ownership Percentage | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Block P Offshore Equatorial Guinea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Project, Ownership, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.90% |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Period of Development Area (Year) |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |
Block P Offshore Equatorial Guinea [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Project, Ownership, Percent |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  | $ 6,800 |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Project, Additional Working Interest Percentage |  |  |  |  | 14.10% |  |  |  |  |  |  |  |  |  |  |  |
Block P Offshore Equatorial Guinea [Member] | Crown Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working Interest Ownership, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |

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