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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 08, 2022 | Dec. 20, 2018 | Mar. 31, 2021 | Sep. 30, 2022 | Dec. 31, 2021
Series A Preferred Unit, Current |  |  |  | $ 109,400,000 | $ 3,200,000
Liabilities, Other than Long-Term Debt, Noncurrent, Total |  |  |  | 0 | $ 45,000,000.0
Total Assets of ABGL Company |  |  |  | 67,200,000 |
Series A Preferred Units Value |  |  |  | $ 109,400,000 |
Carbon Revolving Line [Member] |  |  |  |  |
Repayments of Debt | $ 7,300,000 |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | (49,400,000) |  |  |  |
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 |  | $ 90,000,000 |  |  |
Fees and Commission Transfer Agent |  | 900,000 |  |  |
Debt Instrument, Collateral Amount |  | $ 30,000,000 |  |  |
Preferred Units Issued Value |  |  | $ 3,100,000 |  |
Preferred Units, Issued (in shares) |  |  | 626,000 |  |
Preferred Units Redeemed, Value |  |  |  | $ 116,000,000 |
Preferred Units, Initial Fair Value | 105,800,000 |  |  |  |
Preferred Units Series A [Member] | First Tranche [Member] |  |  |  |  |
Preferred Units Issued Value |  |  |  | $ 16,000,000.0 |
Preferred Units, Issued (in shares) |  |  |  | 3,200,000 |
Preferred Units Series A [Member] | Second Tranche [Member |  |  |  |  |
Preferred Units Issued Value |  |  |  | $ 14,000,000.0 |
Preferred Units, Issued (in shares) |  |  |  | 2,800,000 |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  | 20,000 |
Preferred Units Redeemed, Value |  |  | $ 300,000 |  |
Preferred Units Redeemed (in shares) |  |  | 20,000 |  |
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 |  | $ 30,000,000 |  |  |
Preferred Units Reserved for Future Issuance (in shares) |  | 5,000,000 |  |  |
Preferred Units Series A Redeemable By December 31, 2022 [Member] | ABGL [Member] |  |  |  |  |
Preferred Units Issued Value | 116,000,000 |  |  |  |
Preferred Units Series A Redeemable By September 30, 2022 [Member] | ABGL [Member] |  |  |  |  |
Preferred Units Issued Value | $ 106,000,000 |  |  |  |

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