Note 10 - Commitments and Contingencies (Details Textual)	1 Months Ended	30 Months Ended
	Oct. 31, 2021 bbl	Mar. 31, 2024 USD ($) MMBbls bbl	Dec. 31, 2023 USD ($)	Jul. 01, 2022
Operating Lease, Liability		$ 400,000
TXU Energy Retail Company LLC [Member]
Letters of Credit Outstanding, Amount		$ 4,600,000
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		29,854
Supply Commitment, Percent of Contracted Volume Delivered		81.00%
Supply Commitment, Remaining Minimum Amount Committed, Volume | MMBbls		6.5
Supply Commitment, Amount Committed		$ 5,500,000
Sand Commitments [Member]
Supply Commitment, Amount Committed		19,100,000
Supply Commitment, Minimum Tons of Sand				750,000,000,000
Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset		382,000	$ 510,000
Other Liabilities [Member]
Operating Lease, Liability		$ 400,000	$ 528,000