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Organization and Accounting Policies (Narrative) (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 20, 2026 | Feb. 25, 2021 | Mar. 31, 2022 USD ($) XAF / $ | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) contract XAF / $ | Feb. 24, 2021
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
VAT receivable, gross |  |  | $ 10,200 |  | $ 9,600 |
Exchange rate | XAF / $ |  |  | 590.1 |  | 578.2 |
Other receivables |  |  | $ 11,600 |  |  |
Other accrued liabilities |  |  | 11,600 |  |  |
Prepayments and other, fixed assets |  |  | 3,900 |  |  |
Prepayments and other, royalty expenses |  |  | 2,100 |  |  |
Crude oil and natural gas sales |  |  | 68,656 | $ 39,774 |  |
Net income |  |  | $ 12,164 | 9,869 |  |
Purchase Commitment [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Number of contracts entered into | contract |  |  |  |  | 2 |
Office and Miscellaneous Equipment [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life of assets |  |  | 5 years |  |  |
Leasehold Improvements [Member] | Minimum [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life of assets |  |  | 5 years |  |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life of assets |  |  | 7 years |  |  |
Sasol Gabon S.A. [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Abandonment funding payment due |  |  | $ 4,300 |  |  |
Crude oil and natural gas sales |  |  | 32,400 | 9,400 |  |
Net income |  |  | 5,700 | $ 1,200 |  |
Consortium [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
VAT receivable, gross |  |  | $ 15,800 |  | $ 14,500 |
Prior Production Sharing Contract, Through September 17, 2018 [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Monthly royalty rate, based on production at the published price |  |  | 13.00% |  |  |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Monthly royalty rate, based on production at the published price |  |  | 13.00% |  |  |
Etame Marine Block [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Working interest ownership, percentage |  | 58.80% |  |  |  | 31.10%
Etame Marine Block [Member] | Sasol Gabon S.A. [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage |  | 27.80% |  |  |  |
Etame Marine Block [Member] | Prior Production Sharing Contract, Through September 17, 2018 [Member] | Consortium [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Working interest ownership, percentage |  |  | 7.50% |  |  |
Etame Marine Block [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Working interest ownership, percentage |  |  | 7.50% |  |  |
Etame Marine Block [Member] | Scenario, Forecast [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 1.60% |  |  |  |  |
Etame Marine Block [Member] | Scenario, Forecast [Member] | Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Government Of Gabon [Member] |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in working interest ownership percentage | 2.50% |  |  |  |  |
Working interest ownership, percentage | 10.00% |  |  |  |  |

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