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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2023 | Aug. 08, 2022 | Dec. 20, 2018 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Series A Preferred Unit, Current |  |  |  |  | $ 0 | $ 3,200
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent |  |  |  |  | 116,000 | 45,000
Total Assets of ABGL Company |  |  |  |  | 79,800 |
Series A Preferred Units Value |  |  |  |  | $ 116,000 |
Carbon Revolving Line [Member] |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  | $ (49,400) |  |  |  |
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 |  |  |
Fees and Commission Transfer Agent |  |  | 900 |  |  |
Debt Instrument, Collateral Amount |  |  | $ 30,000,000 |  |  |
Preferred Units Issued Value |  |  |  |  |  | $ 3,100
Preferred Units, Issued (in shares) |  |  |  |  |  | 626,000
Preferred Units Redeemed, Value |  |  |  |  | $ 116,000 |
Preferred Units, Initial Fair Value |  | 105,800 |  |  |  |
Preferred Units Series A [Member] | First Tranche [Member] |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  | $ 16,000 |
Preferred Units, Issued (in shares) |  |  |  |  | 3,200,000 |
Preferred Units Series A [Member] | Second Tranche [Member |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  | $ 14,000 |
Preferred Units, Issued (in shares) |  |  |  |  | 2,800,000 |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  |  | 20,000 |
Preferred Units Redeemed, Value |  |  |  | $ 300 |  | $ 300
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 |  |  |  |
Preferred Units Series A Redeemable By December 31, 2022 [Member] | ABGL [Member] | Subsequent Event [Member] |  |  |  |  |  |
Preferred Units Issued Value | $ 125,000 |  |  |  |  |
Preferred Units Series A Redeemable By September 30, 2022 [Member] | ABGL [Member] |  |  |  |  |  |
Preferred Units Issued Value |  | $ 106,000 |  |  |  |

X
- Definition Represents common units authorized. + References No definition available. + Details
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