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Note 7 - Aemetis Biogas - Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended | 44 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2026 | Feb. 08, 2024 | Dec. 20, 2018 | Dec. 31, 2024 | Dec. 31, 2022 | Aug. 08, 2022 | Mar. 12, 2025 | Dec. 31, 2023
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent |  |  |  | $ 126,593 |  |  |  | $ 113,189
Assets |  |  |  | 259,302 |  |  |  | $ 243,406
California Dairy Renewable Natural Gas [Member] | Asset Pledged as Collateral [Member] | Aemetis Biogas LLC [Member] | Preferred Units Series A [Member] |  |  |  |  |  |  |  |
Assets |  |  |  | 126,100 |  |  |  |
Common Units [Member] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 5,000,000 |  |  |  |  |
Preferred Units Series A [Member] |  |  |  |  |  |  |  |
Common Units Authorized (in shares) |  |  | 11,000,000 |  |  |  |  |
Preferred Units, Authorized (in shares) |  |  | 6,000,000 |  |  |  |  |
Preferred Units Series A [Member] | Second Tranche [Member |  |  |  |  |  |  |  |
Preferred Units, Issued (in shares) |  |  |  |  | 6,000,000 |  |  |
Preferred Units Issued Value |  |  |  |  | $ 30,000 |  |  |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  |  |  | 20,000 |  |
Preferred Units Redeemed, Value |  |  |  |  |  | $ 300 |  |
Series A Preferred Stocks [Member] |  |  |  |  |  |  |  |
Common Units Issued (in shares) |  |  | 6,000,000 |  |  |  |  |
Common Units Issuance Value (in dollars per share) |  |  | $ 5 |  |  |  |  |
PUPA Seventh Amendment [Member] |  |  |  |  |  |  |  |
Preferred Units Issued Value |  | $ 115,500 |  | $ 124,900 |  |  |  |
Credit Agreement, Interest Rate |  | 16.00% |  |  |  |  |  |
PUPA Seventh Amendment [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Preferred Units Issued Value | $ 137,900 |  |  |  |  |  |  |
PUPA Seventh Amendment [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |
Credit Agreement, Interest Rate |  | 10.00% |  |  |  |  |  |
PUPA Eighth Amendment [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Credit Agreement, Interest Rate |  |  |  |  |  |  | 16.00% |
Preferred Stock, Redemption Amount |  |  |  |  |  |  | $ 114,800 |
PUPA Eighth Amendment [Member] | Prime Rate [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Credit Agreement, Interest Rate |  |  |  |  |  |  | 10.00% |

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