Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		1 Months Ended		9 Months Ended		12 Months Ended
		Nov. 30, 2022	Feb. 28, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Sep. 12, 2023	Nov. 14, 2022
Accounts Receivable, after Allowance for Credit Loss, Current				$ 125,982		$ 96,596
Oil and Gas Joint Interest Billing Receivables				6,500		2,200
Income Taxes Receivable				3,200		3,200
Accounts Receivable, Allowance for Credit Loss, Current				0		0
Inventory, Raw Materials and Supplies, Gross				15,100		13,300
Inventory, LIFO Reserve				0
Prepaid Expense				1,700		4,100
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment				847,000,000		696,000,000
Accounts Payable and Accrued Liabilities, Current				294,600		266,100
Payments of Debt Issuance Costs				26,401	$ 9,221
Amortization of Debt Issuance Costs				9,352	3,261
Debt Instrument, Unamortized Discount	[1]			29,542		$ 27,086
Amortization of Debt Discount (Premium)				12,660	4,609
Senior Unsecured Notes and Revolving Credit Facility [Member]
Debt Issuance Costs, Gross				46,100
Payments of Debt Issuance Costs				26,400
Amortization of Debt Issuance Costs				$ 9,400	3,300
Senior Unsecured Notes Due 2024 [Member]
Debt Issuance Costs, Gross							$ 1,500
Payments of Debt Issuance Costs			$ 22,100
Debt Instrument, Interest Rate, Stated Percentage			10.00%	10.00%
Debt Instrument, Unamortized Discount				$ 64,800			3,200
Amortization of Debt Discount (Premium)				$ 12,700	$ 4,600
The 10.625% Senior Notes [Member]
Debt Issuance Costs, Gross							3,700
Payments of Debt Issuance Costs		$ 223,700
Debt Instrument, Interest Rate, Stated Percentage				10.625%				10.625%
Debt Instrument, Unamortized Discount							$ 11,700
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Largest Purchasers [Member]
Concentration Risk, Percentage				96.00%		94.00%
Electric Power Infrastructure [Member]
Accounts Receivable, after Allowance for Credit Loss, Current				$ 0		$ 4,900
Settlements of Derivative Contracts [Member]
Accounts Receivable, after Allowance for Credit Loss, Current				0		4,700
Aid-in-construction Receivables [Member] | WTG Gas Processing, L.P. [Member]
Accounts Receivable, after Allowance for Credit Loss				5,600		6,100
Crude Oil, Natural Gas and Natural Gas Liquids [Member]
Accounts Receivable, after Allowance for Credit Loss, Current				$ 116,300		$ 81,600

[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.