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Note 9 - Aemetis Biogas LLC - Series A Preferred Financing (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended | 44 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 08, 2024 | Dec. 20, 2018 | Dec. 31, 2022 | Aug. 08, 2022 | Mar. 31, 2024 | Dec. 31, 2023
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent |  |  |  |  | $ 116.9 | $ 113.2
Common Units [Member] |  |  |  |  |  |
Proceeds from Issuance of Common Units |  | $ 30.0 |  |  |  |
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 |  |  | $ 30.0 |  |  |
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 |  |  |  |
PUPA Fifth Amendment [Member] |  |  |  |  |  |
Preferred Units Issued Value | $ 111.0 |  |  |  |  |
Credit Agreement, Interest Rate | 16.00% |  |  |  |  |
PUPA Fifth Amendment [Member] | Prime Rate [Member] |  |  |  |  |  |
Credit Agreement, Interest Rate | 10.00% |  |  |  |  |

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