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Note 7 - Long-term Debt (Details Textual) | 1 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2022 USD ($) | Feb. 28, 2022 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Nov. 14, 2022 USD ($) | Oct. 31, 2022 USD ($) | Oct. 14, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2021 USD ($) | Jun. 30, 2021 USD ($)
Debt Instrument, Unamortized Discount, Total |  |  |  | $ 10,212,000 |  |  |  |  |  | $ (0) |  |
Payments of Debt Issuance Costs |  |  |  | 9,221,000 | $ 1,757,000 |  |  |  |  |  |  |
Senior Unsecured Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount, Total |  | $ 14,800,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 225,000,000.0 |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Gross |  |  |  | 225,000,000 |  |  |  |  |  | 0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 10.00% |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  | $ 21,200,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | 203,800,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | The 10.625% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 225,000,000.0 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 10.625% |  |  |  |  |  |
Payments of Debt Issuance Costs | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Gross |  |  |  | 355,000,000 |  |  |  |  |  | 100,000,000 |  |
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 138,800,000 | $ 40,000,000.0 | 400,000,000.0 |  |  |  |  | $ 400,000,000.0 |  | $ 195,000,000.0 | $ 125,000,000.0
Line of Credit Facility, Commitment Fee Amount |  |  | 20,000,000.0 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 138,800,000 | $ 20,000,000.0 | 400,000,000.0 |  |  |  |  | 400,000,000.0 |  | $ 195,000,000.0 | $ 125,000,000.0
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due |  |  |  | 75,000,000.0 |  |  |  |  | 75,000,000.0 |  |  |
Long-Term Debt, Gross |  | $ 0 |  | $ 355,000,000.0 |  |  |  |  |  | 100,000,000.0 |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.50% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio |  |  |  | 3.00 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 550,000,000 | $ 550.0 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  | $ 525,000,000 |  |  |  |  |
Fifth Third Bank, National Association [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 1,500,000,000 |  |  |  |  | $ 1,500,000,000 |  |  |
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 |  |  |  | 14,800,000 |  |  |  |  |  | 0 |  |
Accumulated Amortization, Debt Discount |  |  |  | 4,600,000 |  |  |  |  |  | 0 |  |
Debt Issuance Costs, Gross |  |  |  | 11,800,000 |  |  |  |  |  | 2,600,000 |  |
Accumulated Amortization, Debt Issuance Costs |  |  |  | $ 3,800,000 |  |  |  |  |  | $ 502,000 |  |

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