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Note 7 - Long-term Debt (Details Textual)
$ in Thousands
1 Months Ended 9 Months Ended
Sep. 14, 2023
USD ($)
Sep. 12, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Nov. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Oct. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 14, 2022
USD ($)
Nov. 14, 2022
USD ($)
Oct. 31, 2022
USD ($)
Oct. 31, 2021
USD ($)
Debt Instrument, Unamortized Discount [1]               $ 29,542     $ 27,086        
Payments of Debt Issuance Costs               26,401 $ 9,221            
Redemption Premium $ 4,500                            
Term Loan Credit Agreement [Member]                              
Debt Instrument, Unamortized Discount   $ 30,000           2,700              
Debt Issuance Costs, Gross   $ 23,000                          
Debt Instrument Discount Percentage   0.025                          
Debt Instrument, Optional Prepayment, Percentage of Principal   0.0100                          
Debt Instrument, Covenant, Minimum Current Ratio   0.000150                          
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio   0.000200                          
Debt Instrument, Covenant, Priority Facility Limit   $ 100,000                          
Debt Instrument, Periodic Payment   $ 30,000                          
Term Loan Credit Agreement [Member] | Adjusted SOFR [Member]                              
Debt Instrument, Basis Spread on Variable Rate   0.075%                          
Term Loan Credit Agreement [Member] | Adjusted Above Margin [Member]                              
Debt Instrument, Basis Spread on Variable Rate   0.02%                          
Senior Credit Facility Agreement Due 2026 [Member]                              
Line of Credit Facility, Current Borrowing Capacity               100,000   $ 75,000          
Senior Unsecured Notes Due 2024 [Member]                              
Debt Instrument, Unamortized Discount   $ 3,200           $ 64,800              
Debt Issuance Costs, Gross   1,500                          
Debt Instrument, Face Amount           $ 225,000 $ 225,000       250,000        
Debt Instrument, Interest Rate, Stated Percentage             10.00% 10.00%              
Proceeds from Issuance of Debt             $ 202,900                
Payments of Debt Issuance Costs             22,100                
Long-Term Debt, Gross               $ 0     225,000        
The 10.625% Senior Notes [Member]                              
Debt Instrument, Unamortized Discount   11,700                          
Debt Issuance Costs, Gross   3,700                          
Debt Instrument, Face Amount                       $ 25,000 $ 225,000    
Debt Instrument, Interest Rate, Stated Percentage               10.625%         10.625%    
Proceeds from Issuance of Debt           26,300                  
Payments of Debt Issuance Costs           $ 223,700                  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities         $ 8,300                    
Revolving Credit Facility [Member]                              
Long-Term Debt, Gross               $ 1,200,000     $ 0        
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member]                              
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due       $ 75,000                   $ 250,000  
Line of Credit Facility, Current Borrowing Capacity       400,000     138,800             525,000 $ 195,000
Line of Credit Facility, Maximum Borrowing Capacity     $ 700,000 $ 400,000     138,800             $ 550,000 $ 195,000
Debt Instrument, Covenant, Hedged Notional Amounts, Less than Maximum EBITDAX, Minimum Percentage of Projected Production       25.00%                      
Debt Instrument, Covenant, Hedged Notional Amounts, Greater than Maximum EBITDAX, Minimum Percentage of Projected Production       50.00%                      
Debt Instrument, Covenant, Minimum Availability Percentage for Dividend and Distributions                     25.00%     25.00%  
Debt Instrument, Covenant, Reduced Borrowing Base, Minimum Percentage of Principal                           25.00%  
Line of Credit Facility, Commitment Fee Amount     $ 575,000                        
Debt Instrument, Covenant, Dividends and Distributions Limit                     $ 4,000        
Debt Instrument, Restriction on Borrowings, Minimum Net Proceeds From Equity Securities               95,000              
Long-Term Debt, Gross             $ 0                
Revolving Credit Facility [Member] | Term Loan Credit Agreement [Member]                              
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due   20,000                          
Revolving Credit Facility [Member] | Maximum [Member] | Fifth Third Bank, National Association [Member]                              
Debt Instrument, Face Amount       $ 1,500,000                      
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio       0.000175                      
Revolving Credit Facility [Member] | Maximum [Member] | Term Loan Credit Agreement [Member]                              
Debt Instrument, Face Amount   $ 1,200,000                          
Revolving Credit Facility [Member] | Minimum [Member] | Fifth Third Bank, National Association [Member]                              
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio       0.000125                      
Other Noncurrent Assets [Member]                              
Debt Instrument, Unamortized Discount               30,000     34,800        
Accumulated Amortization, Debt Discount               458,000,000     7,700        
Debt Issuance Costs, Gross               23,000     19,700        
Accumulated Amortization, Debt Issuance Costs               $ 351,000,000     $ 6,100        
[1] Discounts as of September 30, 2023 and December 31, 2022 consisted of $30.0 million and $34.8 million, respectively, in discounts less accumulated amortization of $458,000 and $7.7 million, respectively.