Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Accounts Receivable, after Allowance for Credit Loss, Current		$ 78,356,000		$ 85,242,000
Oil and Gas, Joint Interest Billing, Receivable		3,300,000		4,700,000
Income Taxes Receivable		3,100,000		3,100,000
Accounts Payable and Accrued Liabilities, Current		298,900,000		284,600,000
Accounts Receivable, Allowance for Credit Loss		0		0
Inventory, Raw Materials and Supplies, Gross		8,700,000		11,000,000
Prepaid Expense		8,300,000		4,600,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		1,100,000		1,100,000
Payments of Debt Issuance Costs		(0)	$ 7,000
Amortization of Debt Issuance Costs		2,034,000	2,053,000
Debt Instrument, Unamortized Discount	[1]	14,771,000		17,197,000
Amortization of Debt Discount (Premium)		2,426,000	2,453,000
Income Tax Expense (Benefit)		9,939,000	2,297,000
Texas Margin Tax [Member]
Income Tax Expense (Benefit)		$ 0	223,000
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		0		$ 58,000
Amortization of Debt Issuance Costs		2,000,000	2,100,000
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument, Unamortized Discount		30,000,000
Amortization of Debt Discount (Premium)		$ 2,400,000	$ 2,500,000
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		81.00%		76.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Second Largest Purchaser [Member]
Concentration Risk, Percentage		10.00%		18.00%
Electric Power Infrastructure [Member]
Accounts Payable and Accrued Liabilities, Current		$ 1,900,000		$ 1,400,000
Crude Oil, Natural Gas and Natural Gas Liquids [Member]
Accounts Receivable, after Allowance for Credit Loss, Current		70,100,000		76,000,000
Aid-in-construction Receivables [Member] | WTG Gas Processing, L.P. [Member]
Contract with Customer, Asset, after Allowance for Credit Loss		17,700,000		18,000,000
Aid-in-construction [Member] | WTG Gas Processing, L.P. [Member]
Contract with Customer, Asset, Asset Funding		0		17,500,000
Contract with Customer, Asset, Payments Received		$ 375,000		$ 2,000,000

[1] Discounts as of March 31, 2025 and December 31, 2024 consisted of $30.0 million in discounts less accumulated amortization of $15.2 million and $12.8 million, respectively.