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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	Feb. 28, 2026	Dec. 31, 2022	Aug. 08, 2022	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent						$ 123,558	$ 126,910
Assets						311,995	259,841	$ 241,119
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Prime Rate [Member]
California Dairy Renewable Natural Gas [Member] \| Asset Pledged as Collateral [Member] \| Aemetis Biogas LLC [Member] \| Preferred Units Series A [Member]
Assets						148,500
Credit Agreement [Member] \| Protair-X and Third Eye Capital [Member]
Debt Instrument, Basis Spread on Variable Rate	5.00%
Debt Instrument, Interest Rate, Stated Percentage	12.00%
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			$ 117,300		$ 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, Aggregate Redemption Price, Incremental Fee	$ 2,000
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent						$ 123,600	$ 126,900