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Note 7 - Aemetis Biogas - Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended		44 Months Ended
	Jan. 31, 2026	Feb. 08, 2024	Dec. 20, 2018	Dec. 31, 2024	Dec. 31, 2022	Aug. 08, 2022	Mar. 12, 2025	Dec. 31, 2023
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent				$ 126,593				$ 113,189
Assets				259,302				$ 243,406
California Dairy Renewable Natural Gas [Member] \| Asset Pledged as Collateral [Member] \| Aemetis Biogas LLC [Member] \| Preferred Units Series A [Member]
Assets				126,100
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 Seventh Amendment [Member]
Preferred Units Issued Value		$ 115,500		$ 124,900
Credit Agreement, Interest Rate		16.00%
PUPA Seventh Amendment [Member] \| Forecast [Member]
Preferred Units Issued Value	$ 137,900
PUPA Seventh Amendment [Member] \| Prime Rate [Member]
Credit Agreement, Interest Rate		10.00%
PUPA Eighth Amendment [Member] \| Subsequent Event [Member]
Credit Agreement, Interest Rate							16.00%
Preferred Stock, Redemption Amount							$ 114,800
PUPA Eighth Amendment [Member] \| Prime Rate [Member] \| Subsequent Event [Member]
Credit Agreement, Interest Rate							10.00%