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Long-Term Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Nov. 30, 2020
Icahn Enterprises        
Debt Instrument        
Interest expense paid to related party $ 100,000 $ 300,000    
New Credit Facility        
Debt Instrument        
Maximum borrowing capacity       $ 30,000,000.0
Total net leverage ratio (no greater than) 3.50 3.50    
Interest coverage ratio (no less than) 2.25 2.25    
Leverage ratio (0.15) (0.15)    
Coverage ratio 59.73 59.73    
New Credit Facility | Revolving Credit Facility        
Debt Instrument        
Maximum borrowing capacity $ 10,000,000.0 $ 10,000,000.0    
Remaining borrowing capacity 10,000,000.0 10,000,000.0    
New Credit Facility | Term Loan        
Debt Instrument        
Maximum borrowing capacity 20,000,000 $ 20,000,000    
New Credit Facility | Minimum | LIBOR        
Debt Instrument        
Basis spread on variable rate (basis points)   2.00%    
New Credit Facility | Minimum | Base Rate        
Debt Instrument        
Basis spread on variable rate (basis points)   1.00%    
New Credit Facility | Maximum | LIBOR        
Debt Instrument        
Basis spread on variable rate (basis points)   3.00%    
New Credit Facility | Maximum | Base Rate        
Debt Instrument        
Basis spread on variable rate (basis points)   2.00%    
New Credit Facility | Revolving Credit Facility        
Debt Instrument        
Maximum borrowing capacity $ 20,000,000.0 $ 20,000,000.0 $ 20,000,000.0  
Average interest rate during period 2.60% 2.62%    
Percentage of proved reserves pledged as collateral 95.00% 95.00%