Note 7 - Long-term Debt (Details Textual) $ in Thousands					1 Months Ended							12 Months Ended			15 Months Ended
		Nov. 01, 2023 USD ($)	Sep. 14, 2023 USD ($)	Sep. 12, 2023 USD ($)	Jul. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Nov. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Feb. 28, 2022 USD ($)	Oct. 31, 2021 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)	Nov. 14, 2022	Oct. 31, 2022 USD ($)
Debt Instrument, Unamortized Discount, Total	[1]											$ 17,197	$ 27,062		$ 17,197
Payments of Debt Issuance Costs												58	28,444	$ 17,128
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
Repayments of Debt															120,000
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]
Debt Issuance Costs, Gross		$ 1,100
Line of Credit Facility, Current Borrowing Capacity		$ 100,000
Senior Credit Facility Agreement Due 2026 [Member] | Adjusted Above Margin [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Senior Credit Facility Agreement Due 2026 [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		5.00%
Senior Credit Facility Agreement Due 2026 [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		4.00%
Senior Credit Facility Agreement Due 2026 [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		4.00%
Senior Credit Facility Agreement Due 2026 [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		3.00%
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument, Unamortized Discount, Total				$ 3,200								$ 64,800			$ 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%			10.00%
Payments of Debt Issuance Costs										$ 202,900
Proceeds from Issuance of Debt										22,100
The 10.625% Senior Notes [Member]
Debt Instrument, Unamortized Discount, Total				11,700
Debt Issuance Costs, Gross				3,700
Debt Instrument, Face Amount								225,000						$ 25,000
Debt Instrument, Interest Rate, Stated Percentage												10.625%			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												$ 1,080,000	1,200,000		$ 1,080,000
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						$ 550,000
Line of Credit Facility, Commitment Fee Amount							$ 575,000			138,800	$ 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%
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	30,000		30,000
Accumulated Amortization, Debt Discount												12,800	2,900		12,800
Debt Issuance Costs, Gross												25,100	25,000		25,100
Accumulated Amortization, Debt Issuance Costs												$ 10,700	$ 2,400		$ 10,700

[1] Discounts as of December 31, 2024 and 2023 consisted of $30.0 million and $30.0 million, respectively, in discounts less accumulated amortization of $12.8 million and $2.9 million, respectively.