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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 6 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2023 | May 31, 2023 | Jan. 01, 2023 | Aug. 08, 2022 | Dec. 20, 2018 | Jun. 30, 2023 | Dec. 31, 2022 | Aug. 31, 2024
Series A Preferred Units Value |  |  |  |  |  | $ 129.7 | $ 116.0 |
Total Assets of ABGL Company |  |  |  |  |  | $ 79.0 |  |
Carbon Revolving Line [Member] |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 7.3 |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  | (49.4) |  |  |  |
Preferred Units Series A [Member] |  |  |  |  |  |  |  |
Common Units Authorized (in shares) |  |  |  |  | 11,000,000 |  |  |
Common Units Issued (in shares) |  |  |  |  | 6,000,000 |  |  |
Preferred Unit Dividend Rate Per Dollar Amount (in dollars per share) |  |  |  |  | $ 0.50 |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  | 1,200,000 | 5,000,000 |  |
Maximum Number of Shares (in shares) |  |  |  |  | 5,000,000 |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Redemption Value per Unit (in dollars per share) |  |  |  |  | $ 15 |  |  |
Free Cash Flow Generated by ABGL |  |  |  |  | 75.00% | 100.00% |  |
Redeemable Noncontrolling Interest Equity Redemption Value, Total |  |  |  |  | $ 90.0 |  |  |
Fees and Commission Transfer Agent |  |  |  |  | 0.9 |  |  |
Debt Instrument, Collateral Amount |  |  |  |  | $ 30,000.0 |  |  |
Preferred Units Series A [Member] | First Tranche [Member] |  |  |  |  |  |  |  |
Preferred Units, Issued (in shares) |  |  |  |  |  | 3,200,000 |  |
Preferred Units Issued Value |  |  |  |  |  | $ 16.0 |  |
Preferred Units Series A [Member] | Second Tranche [Member |  |  |  |  |  |  |  |
Preferred Units, Issued (in shares) |  |  |  |  |  | 2,800,000 |  |
Preferred Units Issued Value |  |  |  |  |  | $ 14.0 |  |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  |  |  | 20,000 |  |
Preferred Units Redeemed, Value |  |  |  |  |  | $ 0.3 |  |
Series A Preferred Stocks [Member] |  |  |  |  |  |  |  |
Common Units Issued (in shares) |  |  |  |  | 6,000,000 |  |  |
Common Units Issuance Value (in dollars per share) |  |  |  |  | $ 5.00 |  |  |
Proceeds from Issuance of Common Units |  |  |  |  | $ 30,000.0 |  |  |
Preferred Units Reserved for Future Issuance (in shares) |  |  |  |  | 5,000,000 |  |  |
PUPA Second Amendment [Member] |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  | $ 159.0 | 116.0 |  |  |  |
PUPA Second Amendment [Member] | ABGL [Member] |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  | $ 125.0 | $ 106.0 |  |  |  |
PUPA Third Amendment [Member] |  |  |  |  |  |  |  |
Preferred Units Issued Value |  | $ 127.2 |  |  |  |  |  | $ 171.7
PUPA Third Amendment [Member] | ABGL [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Preferred Units Issued Value | $ 135.0 |  |  |  |  |  |  |

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