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v3.22.2

Note 10 - Commitments and Contingencies (Details Textual) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) bbl | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) a
Oncor [Member] |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 1,900,000
TXU Energy Retail Company LLC [Member] |  |  |
Letters of Credit Outstanding, Amount | $ 1,700,000 |  |
TEXAS |  |  |
Area of Land (Acre) | a |  |  | 80
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 | 17,503 |  |
Supply Commitment, Amount Committed | $ 22,200,000 |  |
Sand Commitments [Member] |  |  |
Supply Commitment, Amount Committed | $ 8,700,000 |  |
Supply Commitment, Minimum Tons of Sand | 600,000 |  |
Other Noncurrent Assets [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 579,000 | $ 852,000 |
Other Liabilities [Member] |  |  |
Operating Lease, Liability, Total | 591,000 | 856,000 |
Other Current Liabilities [Member] |  |  |
Operating Lease, Liability, Current | 475,000 | 513,000 |
Other Noncurrent Liabilities [Member] |  |  |
Operating Lease, Liability, Noncurrent | $ 116,000 | $ 343,000 |

X
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