Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.22.0.1
Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]    
Deferred tax assets $ 86,927,000 $ 126,252,000
Valuation allowance 46,949,000 126,252,000
Interest or penalties accrued 0 0
Uncertain tax positions $ 0 $ 0
Prior Production Sharing Contract, Through September 17, 2018 [Member]    
Income Taxes [Line Items]    
Entitled percent for consortium after initial royalty percentage 70.00%  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member]    
Income Taxes [Line Items]    
Entitled percent for consortium after initial royalty percentage 80.00%  
Production Sharing Contract, After September 16, 2028 [Member]    
Income Taxes [Line Items]    
Entitled percent for consortium after initial royalty percentage 70.00%  
Minimum [Member]    
Income Taxes [Line Items]    
Allocation of remaining profit production, government payments, percentage 50.00%  
Minimum [Member] | Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Foreign tax credit carryforward, expiration dates Dec. 31, 2035  
Minimum [Member] | Foreign Tax Authority [Member]    
Income Taxes [Line Items]    
Foreign tax credit carryforward, expiration dates Dec. 31, 2021  
Maximum [Member]    
Income Taxes [Line Items]    
Allocation of remaining profit production, government payments, percentage 60.00%  
Maximum [Member] | Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Foreign tax credit carryforward, expiration dates Dec. 31, 2037  
Maximum [Member] | Foreign Tax Authority [Member]    
Income Taxes [Line Items]    
Foreign tax credit carryforward, expiration dates Dec. 31, 2025