Note 10 - Commitments and Contingencies (Details Textual)	9 Months Ended
	Sep. 30, 2023 USD ($) bbl	Jun. 30, 2023 USD ($) T MMBbls bbl	Dec. 31, 2022 USD ($)	Jul. 01, 2022	Jun. 30, 2022 USD ($)
Operating Lease, Liability, Current	$ 517,000		$ 343,000
Operating Lease, Liability, Noncurrent	$ 136,000		0
TXU Energy Retail Company LLC [Member]
Letters of Credit Outstanding, Amount					$ 1,700,000
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	28,008
Supply Commitment, Percent of Contracted Volume Delivered	61.00%
Supply Commitment, Remaining Minimum Amount Committed, Volume | MMBbls		13.3
Supply Commitment, Amount Committed		$ 10,900,000
Connection Fee Commitments [Member]
Supply Commitment, Amount Committed		526,000
Sand Commitments [Member]
Supply Commitment, Amount Committed		$ 14,500,000
Supply Commitment, Minimum Tons of Sand				1,600,000
Supply Commitment, Sand Purchased | T		988,000
Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset		$ 637,000	333,000
Other Liabilities [Member]
Operating Lease, Liability		653,000	$ 343,000
Other Current Liabilities [Member]
Operating Lease, Liability, Current		517,000
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent		$ 136,000