Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)		1 Months Ended		3 Months Ended		12 Months Ended
		Nov. 30, 2022 USD ($)	Feb. 28, 2022 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 14, 2023 USD ($)	Dec. 31, 2022	Nov. 20, 2022
Accounts Receivable, after Allowance for Credit Loss, Current				$ 109,005,000		$ 94,589,000
Oil and Gas, Joint Interest Billing, Receivable				6,400,000		4,400,000
Income Taxes Receivable				2,800,000		3,200,000
Accounts Receivable, Allowance for Credit Loss				0		0
Inventory, Raw Materials and Supplies, Gross				11,200,000		7,300,000
Prepaid Expense				2,800,000		1,000,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment				935,000,000,000		904,000,000,000
Accounts Payable and Accrued Liabilities, Current				288,000,000		287,400,000
Payments of Debt Issuance Costs				7,000	$ 544,000
Amortization of Debt Issuance Costs				2,053,000	2,668,000
Debt Instrument, Unamortized Discount	[1]			24,609,000		27,062,000
Amortization of Debt Discount (Premium)				2,453,000	4,290,000
Income Tax Expense (Benefit)				$ 2,297,000	14,507,000
Number of Operating Segments				1
Texas Margin Tax [Member]
Income Tax Expense (Benefit)				$ 223,000	0
Minimum [Member]
Oil and Natural Gas Marketing Contracts, Term Over Which Consideration is Received from Purchaser				1 month
Maximum [Member]
Oil and Natural Gas Marketing Contracts, Term Over Which Consideration is Received from Purchaser				2 months
Senior Unsecured Notes and Revolving Credit Facility [Member]
Debt Issuance Costs, Gross				$ 25,100,000
Payments of Debt Issuance Costs				7,000,000,000		$ 28,400,000
Amortization of Debt Issuance Costs				$ 2,100,000	2,700,000
Senior Unsecured Notes Due 2024 [Member]
Debt Issuance Costs, Gross			$ 1,500,000
Payments of Debt Issuance Costs			$ 22,100,000
Debt Instrument, Interest Rate, Stated Percentage			10.00%	10.00%
Debt Instrument, Unamortized Discount			$ 3,200,000	$ 64,800,000
Amortization of Debt Discount (Premium)				$ 2,500,000	$ 4,300,000
The 10.625% Senior Notes [Member]
Debt Issuance Costs, Gross							$ 3,700,000
Payments of Debt Issuance Costs		$ 26,300,000
Debt Instrument, Interest Rate, Stated Percentage				10.625%				10.625%	10.625%
Debt Instrument, Unamortized Discount							$ 11,700,000
Transportation Equipment [Member]
Property, Plant and Equipment, Useful Life				5 years
Building [Member]
Property, Plant and Equipment, Useful Life				40 years
Field Equipment [Member]
Property, Plant and Equipment, Useful Life				7 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life				5 years
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Purchaser [Member]
Concentration Risk, Percentage				76.00%		82.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Second Largest Purchaser [Member]
Concentration Risk, Percentage				17.00%		14.00%
Settlements of Derivative Contracts [Member]
Accounts Receivable, after Allowance for Credit Loss, Current				$ 446,000		$ 4,500,000
Aid-in-construction Receivables [Member] | WTG Gas Processing, L.P. [Member]
Accounts Receivable, after Allowance for Credit Loss				4,700,000		5,200,000
Crude Oil, Natural Gas and Natural Gas Liquids [Member]
Accounts Receivable, after Allowance for Credit Loss, Current				$ 99,400,000		$ 82,500,000

[1] Discounts as of March 31, 2024 and December 31, 2023 consisted of $30.0 million in discounts less accumulated amortization of $5.4 million and $2.9 million, respectively.