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Note 7 - Long-term Debt (Details Textual)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 14, 2023
USD ($)
Sep. 12, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Nov. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Oct. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nov. 01, 2023
USD ($)
Dec. 14, 2022
USD ($)
Nov. 14, 2022
Oct. 31, 2022
USD ($)
Debt Instrument, Unamortized Discount, Total [1]                     $ 27,062 $ 27,086          
Payments of Debt Issuance Costs                     28,444 17,128 $ 2,169        
Redemption Premium $ 4,500                                
Fifth Third Bank, National Association [Member]                                  
Debt Instrument, Face Amount                     1,500,000            
Term Loan Credit Agreement [Member]                                  
Debt Instrument, Unamortized Discount, Total   $ 30,000                 2,700            
Debt Issuance Costs, Gross   $ 24,000                              
Debt Instrument Discount Percentage   0.025                              
Debt Instrument, Optional Prepayment, Percentage of Principal   0.01                              
Debt Instrument, Covenant, Minimum Current Ratio   1.5                              
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio   2                              
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   7.50%                              
Term Loan Credit Agreement [Member] | Adjusted Above Margin [Member]                                  
Debt Instrument, Basis Spread on Variable Rate   2.00%                              
Senior Credit Facility Agreement Due 2026 [Member]                                  
Line of Credit Facility, Current Borrowing Capacity                     75,000     $ 100,000      
Senior Unsecured Notes Due 2024 [Member]                                  
Debt Instrument, Unamortized Discount, Total   $ 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%            
Payments of Debt Issuance Costs             $ 202,900                    
Proceeds from Issuance of Debt             22,100                    
Long-Term Debt, Gross                     $ 0 225,000          
The 10.625% Senior Notes [Member]                                  
Debt Instrument, Unamortized Discount, Total   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%  
Payments of Debt Issuance Costs         223,700                        
Proceeds from Issuance of Debt         $ 26,300                        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities     $ 8,300                            
Revolving Credit Facility [Member]                                  
Debt Instrument, Covenant, Minimum Availability Percentage for Dividend and Distributions                                 30.00%
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                                 $ 250,000
Line of Credit Facility, Current Borrowing Capacity           $ 400,000                     525,000
Line of Credit Facility, Maximum Borrowing Capacity       $ 700,000   $ 400,000 138,800 $ 195,000 $ 125,000 $ 40,000             $ 550,000
Line of Credit Facility, Commitment Fee Amount       $ 575,000     138,800 $ 195,000 $ 125,000 $ 20,000              
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%
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] | Maximum [Member] | Fifth Third Bank, National Association [Member]                                  
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio           1.75                      
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due           $ 75,000                      
Revolving Credit Facility [Member] | Minimum [Member] | Fifth Third Bank, National Association [Member]                                  
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio                     1.25            
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] | Term Loan Credit Agreement [Member] | Maximum [Member]                                  
Debt Instrument, Face Amount   $ 1,200,000                              
Other Noncurrent Assets [Member]                                  
Debt Instrument, Unamortized Discount, Total                     $ 30,000 34,800          
Accumulated Amortization, Debt Discount                     2,900 7,700          
Debt Issuance Costs, Gross                     25,000 19,700          
Accumulated Amortization, Debt Issuance Costs                     $ 2,400 $ 6,100          
[1] Discounts as of December 31, 2023 and 2022 consisted of $30.0 million and $34.8 million, respectively, in discounts less accumulated amortization of $2.9 million and $7.7 million, respectively.