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Crude Oil and Natural Gas Properties and Equipment (Narrative) (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 20, 2026 | Apr. 12, 2021 | Feb. 25, 2021 | Mar. 31, 2022 USD ($) contract item | Dec. 31, 2020 USD ($) | Feb. 24, 2021 | Mar. 31, 2020 USD ($) | Dec. 31, 2012
Etame Marine Block [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Working interest ownership, percentage |  |  | 58.80% |  |  | 31.10% |  |
Undeveloped acreage |  |  |  |  |  |  | $ 2.3 |
Undeveloped leasehold value |  |  |  |  |  |  | $ 11.5 |
Etame Marine Block [Member] | VAALCO Gabon S.A. [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Working interest ownership, percentage |  |  |  | 63.575% |  |  |  |
Prior Production Sharing Contract, Through September 17, 2018 [Member] | Etame Marine Block [Member] | Consortium [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Working interest ownership, percentage |  |  |  | 7.50% |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Deferred tax assets, basis difference in fixed assets |  |  |  | $ 18.6 |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Consortium [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Entitled percent for consortium after initial royalty percentage |  |  |  | 80.00% |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Signing Bonus [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Allocated to unproved leasehold cost |  |  |  | $ 6.7 |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Tax Impact [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Allocated to unproved leasehold cost |  |  |  | $ 7.1 |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Etame Marine Block [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of exploitation areas | item |  |  |  | 3 |  |  |  |
Period of agreement for exploitation areas |  |  |  | 10 years |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Etame Marine Block [Member] | Government Of Gabon [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Working interest ownership, percentage |  |  |  | 7.50% |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Scenario, Forecast [Member] | Etame Marine Block [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 1.60% |  |  |  |  |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Scenario, Forecast [Member] | Etame Marine Block [Member] | Government Of Gabon [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Working interest ownership, percentage | 10.00% |  |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 2.50% |  |  |  |  |  |  |
Production Sharing Contract, After September 16, 2028 [Member] | Consortium [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Entitled percent for consortium after initial royalty percentage |  |  |  | 70.00% |  |  |  |
Production Sharing Contract, After September 16, 2028 [Member] | Etame Marine Block [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of contract extension periods | contract |  |  |  | 2 |  |  |  |
Production license agreement term extended by government |  |  |  | 5 years |  |  |  |
Sasol Gabon S.A. [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Undeveloped acreage |  |  |  | $ 2.2 |  |  |  |
Sasol Gabon S.A. [Member] | Etame Marine Block [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage |  |  | 27.80% |  |  |  |  |
Undeveloped leasehold value |  |  |  | 13.7 |  |  |  |
Block P Offshore Equatorial Guinea [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Working interest ownership, percentage |  |  |  |  | 43.00% |  |  | 31.00%
Increase (decrease) in working interest ownership percentage |  | 45.90% |  |  | 12.00% |  |  |
Undeveloped acreage |  |  |  | $ 10.0 |  |  |  |
Potential payment |  |  |  |  | $ 3.1 |  |  |
Period of development |  |  |  | 25 years |  |  |  |

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