Quarterly report pursuant to Section 13 or 15(d)

Organization and Accounting Policies (Narrative) (Details)

v3.22.1
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%