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Note 7 - Crude Oil and Natural Gas Properties and Equipment (Details Textual) $ in Millions |  |  | 6 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 20, 2026 | Sep. 25, 2018 | Jun. 30, 2022 USD ($) | Sep. 16, 2028 | Jul. 15, 2022 | Apr. 12, 2021 | Feb. 25, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 17, 2018 USD ($) | Dec. 31, 2012
Block P Offshore Equatorial Guinea [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 12.00% |  |  | 31.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  |  |  |  |  | 43.00% |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  |  | $ 3.1 |  |  |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  |  |  |  | 58.80% |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  |  |  |  | $ 2.2 |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Property, Plant and Equipment |  |  |  |  |  |  |  |  |  | $ 18.6 |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Signing Bonus [Member] |  |  |  |  |  |  |  |  |  |  |
Capitalized Costs, Unproved Properties |  |  |  |  |  |  |  |  |  | 6.7 |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Tax Effect [Member] |  |  |  |  |  |  |  |  |  |  |
Capitalized Costs, Unproved Properties |  |  |  |  |  |  |  |  |  | $ 7.1 |
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% |  |  |  |  |  |  |  |  |  |
Etame Marine Block [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 63.575% |  |  |  |  |  |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  |  |  |  |  |  | $ 2.3 |  |
Undeveloped Leasehold Value |  |  | $ 13.7 |  |  |  |  |  | $ 11.5 |  |
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] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 45.90% |  |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  | $ 10.0 |  |  |  |  |  |  |  |
Period of Development Area (Year) |  |  | 25 years |  |  |  |  |  |  |  |
Block P Offshore Equatorial Guinea [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Working Interest Ownership, Percentage |  |  |  |  | 80.00% |  |  |  |  |  |
Block P Offshore Equatorial Guinea [Member] | Subsequent Event [Member] | GEPetrol [Member] |  |  |  |  |  |  |  |  |  |  |
Working Interest Ownership, Percentage |  |  |  |  | 20.00% |  |  |  |  |  |

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