Note 10 - Commitments and Contingencies (Details Textual)	14 Months Ended
	Jun. 30, 2025 USD ($) T bbl	Dec. 31, 2024 USD ($)
Operating Lease, Right-of-Use Asset	$ 1,400,000	$ 1,400,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets	Other noncurrent assets
Operating Lease, Liability	$ 1,434,000	$ 1,400,000
Operating Lease, Liability, Current	$ 912,000	$ 719,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Liabilities, Current	Liabilities, Current
Operating Lease, Liability, Noncurrent	$ 522,000	$ 670,000
Contributions in Aid of Construction	14,400,000	$ 5,400,000
Letters of Credit Outstanding, Amount	4,600,000
Crude Oil Delivery Commitments [Member]
Supply Commitment, Minimum Volume Commitment	$ 138,700,000
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Remaining Term of Contract | bbl	23,500
Number of Barrels, Delivered | bbl	30,698
Supply Commitment, Amount Committed	$ 123,900,000
Natural Gas Delivery Commitments [Member]
Supply Commitment, Amount Committed	$ 12,800,000
Sand Commitments [Member]
Supply Commitment, Minimum Tons of Sand | T	750,000