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Note 7 - Long-term Debt (Details Textual)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Aug. 08, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Nov. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Dec. 31, 2020
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 14, 2022
USD ($)
Nov. 14, 2022
USD ($)
Oct. 31, 2022
USD ($)
Oct. 31, 2021
USD ($)
Debt Instrument, Unamortized Discount, Total [1]     $ 18,459         $ 18,459   $ 27,086        
Payments of Debt Issuance Costs               1,399 $ 9,098          
Senior Unsecured Notes Due 2024 [Member]                            
Debt Instrument, Unamortized Discount, Total     34,800         34,800            
Debt Instrument, Face Amount         $ 225,000 $ 225,000       250,000        
Long-Term Debt, Gross     $ 225,000         $ 225,000   225,000        
Debt Instrument, Interest Rate, Stated Percentage     10.00%     10.00%   10.00%            
Proceeds from Issuance of Debt           $ 202,900                
Payments of Debt Issuance Costs           22,100                
The 10.625% Senior Notes [Member]                            
Debt Instrument, Face Amount                     $ 25,000 $ 225,000    
Debt Instrument, Interest Rate, Stated Percentage     10.625%         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     525,000         $ 525,000   $ 270,000        
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000   575,000 $ 700,000   138,800   575,000 400,000       $ 550,000 $ 195,000
Line of Credit Facility, Current Borrowing Capacity 400,000         138,800     400,000       525,000 $ 195,000
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due $ 75,000     75,000         $ 75,000       $ 250,000  
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio                   3.00        
Debt Instrument, Covenant, Hedged Notional Amounts, Less than Maximum EBITDAX, Minimum Percentage of Projected Production 25.00%               25.00%          
Debt Instrument, Covenant, Hedged Notional Amounts, Greater than Maximum EBITDAX, Minimum Percentage of Projected Production 50.00%               50.00%          
Debt Instrument, Covenant, Minimum Availability Percentage for Dividend and Distributions 30.00%               30.00% 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       575,000            
Debt Instrument, Covenant, Dividends and Distributions Limit                   $ 4,000        
Long-Term Debt, Gross       525,000   $ 0       $ 270,000        
Debt Instrument, SOFR Floor             0.00%              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.50%                
Debt Instrument, Covenant, Minimum Current Ratio                   1.00        
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate             0.50%              
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]                            
Debt Instrument, Restriction on Borrowings, Minimum Net Proceeds From Equity Securities   $ 95,000                        
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member] | Maximum [Member]                            
Debt Instrument, Face Amount $ 1,500,000     $ 1,500,000         $ 1,500,000          
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio 1.75                          
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member] | Minimum [Member]                            
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio 1.25                          
Fifth Third Bank, National Association [Member] | Letter of Credit [Member] | London Interbank Offered Rate (LIBOR), Applicable Margin [Member]                            
Debt Instrument, Basis Spread on Variable Rate           0.125%                
Other Noncurrent Assets [Member]                            
Debt Instrument, Unamortized Discount, Total     34,800         34,800   $ 34,800        
Accumulated Amortization, Debt Discount     16,400         16,400   7,700        
Debt Issuance Costs, Gross     20,400         20,400   19,700        
Accumulated Amortization, Debt Issuance Costs     $ 11,800         $ 11,800   $ 6,100        
[1] Discounts as of June 30, 2023 and December 31, 2022 consisted of $34.8 million and $34.8 million, respectively, in discounts less accumulated amortization of $16.4 million and $7.7 million, respectively.