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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.

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