Note 10 - Commitments and Contingencies (Details Textual)	1 Months Ended	6 Months Ended	33 Months Ended
	Oct. 31, 2021 bbl	Jun. 30, 2024 USD ($) T MMBbls	Jun. 30, 2024 USD ($) MMBbls bbl	Dec. 31, 2025 USD ($)	Jul. 01, 2025	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Other noncurrent assets	Other noncurrent assets					Other noncurrent assets
Operating Lease, Right-of-Use Asset		$ 574,000	$ 574,000					$ 510,000
Operating Lease, Liability		587,000	587,000					528,000
Operating Lease, Liability, Current		$ 422,000	$ 422,000					528,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Operating Lease, Liability, Current	Operating Lease, Liability, Current
Operating Lease, Liability, Noncurrent		$ 165,000	$ 165,000					$ 0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Operating Lease, Liability, Noncurrent	Operating Lease, Liability, Noncurrent
TXU Energy Retail Company LLC [Member]
Letters of Credit Outstanding, Amount							$ 4,600,000
Forecast [Member]
Contributions in Aid of Construction				$ 27,200,000		$ 5,400,000
Crude Oil Delivery Commitments [Member]
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Year One (Barrel of Oil) | bbl	5,000
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Year Two (Barrel of Oil) | bbl	7,500
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Remaining Term of Contract (Barrel of Oil) | bbl	10,000
Supply Commitment, Remaining Term of Contract (Year)	8 years
Number of Barrels, Delivered (Barrel of Oil) | bbl			29,710
Supply Commitment, Percent of Contracted Volume Delivered			88.00%
Supply Commitment, Remaining Minimum Amount Committed, Volume | MMBbls		4	4
Supply Commitment, Amount Committed		$ 3,300,000	$ 3,300,000
Sand Commitments [Member]
Supply Commitment, Amount Committed		$ 14,100,000	$ 14,100,000
Supply Commitment, Minimum Tons of Sand					750,000,000,000
Supply Commitment, Tons of Sand Received (US Ton) | T		198,000
Supply Commitment, Tons of Sand Remaining (US Ton) | T		552,000