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Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Nov. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Face value of long-term debt   $ 20,000,000 $ 57,500,000
Repayments of long-term debt   $ 96,500,000 153,596,000
New Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 30,000,000    
Interest rate during period   3.20%  
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination   95.00%  
Ratio of indebtedness to assets   3.50  
Minimum consolidated interest coverage ratio   2.25  
Ratio of indebtedness to assets   (0.15)  
Interest coverage ratio   26.71  
New Credit Facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity 10,000,000    
Available borrowing capacity   $ 10,000,000.0  
New Credit Facility | Term Loan      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 20,000,000    
Face value of long-term debt   20,000,000 0
New Credit Facility | Minimum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
New Credit Facility | Minimum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
New Credit Facility | Maximum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.00%    
New Credit Facility | Maximum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
Prior Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   75,000,000.0  
Face value of long-term debt   $ 0 $ 57,500,000
Repayments of long-term debt $ 12,000,000.0    
Interest rate during period   3.20%  
Line of credit facility, unused capacity, commitment fee percentage   0.50%  
Prior Credit Facility | Minimum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   2.00%  
Prior Credit Facility | Minimum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.00%  
Prior Credit Facility | Maximum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   3.00%  
Prior Credit Facility | Maximum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate   2.00%