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Note 11 - Aemetis Biogas LLC - Series A Preferred Financing (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended | 44 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 07, 2025 | Dec. 20, 2018 | Oct. 31, 2025 | Dec. 31, 2022 | Aug. 08, 2022 | Sep. 30, 2025 | Dec. 31, 2024
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent |  |  |  |  |  | $ 131,010 | $ 126,593
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Prime Rate [Member] |  |  |  |  |  |
Credit Agreement [Member] | Protair-X and Third Eye Capital [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 10.00% |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 16.00% |  |  |  |  |  |
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 Ninth Amendment [Member] |  |  |  |  |  |  |
Preferred Units Issued Value |  |  | $ 118,800 |  |  |  |
Preferred Units, Aggregate Redemption Price, Incremental Fee | $ 2,000 |  |  |  |  |  |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent |  |  |  |  |  | $ 131,000 | $ 126,600

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