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Note 6 - Aemetis Biogas - Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($) |  |  |  |  |  |  |  |  | 12 Months Ended | 14 Months Ended | 15 Months Ended | 17 Months Ended | 44 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2023 | Oct. 06, 2023 | Aug. 31, 2023 | May 31, 2023 | Feb. 08, 2023 | Jan. 01, 2023 | Aug. 08, 2022 | Dec. 20, 2018 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 24, 2024 | Aug. 31, 2024 | May 31, 2024 | Aug. 08, 2022 | Feb. 08, 2024
Payments for Repurchase of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  | $ 30,000,000 | $ (0) |  |  |  |  |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent |  |  |  |  |  |  |  |  | 113,200,000 | 116,000,000 |  |  |  |  |
Assets |  |  |  |  |  |  |  |  | 243,406,000 | 207,114,000 |  |  |  |  |
California Dairy Renewable Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  | 92,794,000 | 77,714,000 |  |  |  |  |
California Dairy Renewable Natural Gas [Member] | Asset Pledged as Collateral [Member] | Aemetis Biogas LLC [Member] | Preferred Units Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  | $ 90,300,000 |  |  |  |  |  |
Carbon Revolving Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  |  |  |  | $ (49,400,000) |  |  |  |  |  |  |  |
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 Unit Dividend Rate Per Dollar Amount (in dollars per share) |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |  |  |
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 Series A [Member] | First Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units, Issued (in shares) |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  | 3,200,000 |
Preferred Units Issued Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,000,000 |
Preferred Units Series A [Member] | Second Tranche [Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units, Issued (in shares) |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |  | 2,800,000 |
Preferred Units Issued Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000 |
Stock Redeemed or Called During Period, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
Preferred Units Redeemed, Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |
Preferred Units Series A [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |
Series A Preferred Stocks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Units Issued (in shares) |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |
Common Units Issuance Value (in dollars per share) |  |  |  |  |  |  |  | $ 5 |  |  |  |  |  |  |
Proceeds from Issuance of Common Units |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |
PUPA Second Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  |  |  | $ 116,000,000 |  |  | $ 116,000,000 |  |  |  |  |
PUPA Second Amendment [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 159,000,000 |  |
PUPA Second Amendment [Member] | ABGL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  |  | $ 125,000,000 | $ 106,000,000 |  |  |  |  |  |  |  |
PUPA Third Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  |  | $ 127,200,000 |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Income Tax Credits |  | $ 55,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
PUPA Third Amendment [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  |  |  |  |  |  |  |  | $ 171,700,000 |  |  |
PUPA Third Amendment [Member] | ABGL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  | $ 135,000,000 |  |  |  |  |  |  |  |  |  |  |  |
PUPA Fourth Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value | $ 110,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount | 108,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing Fee | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PUPA Fourth Amendment [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,500,000
PUPA Fourth Amendment [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Carrying Amount of Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  | $ 130,000,000 |  |  |  |
PUPA Fifth Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units Issued Value |  |  |  |  | $ 111,000,000 |  |  |  |  |  |  |  |  |  |
PUPA Fifth Amendment [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 111,000,000

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