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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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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Name Accounting Standards Codification
-Section S99
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