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Note 5 - Debt (Details Textual) - USD ($) $ / shares in Units, shares in Thousands						9 Months Ended		24 Months Ended
	Jul. 28, 2023	May 16, 2023	Oct. 04, 2022	Mar. 02, 2022	Jul. 06, 2012	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2019	Jun. 30, 2025	Dec. 31, 2024	Nov. 30, 2024	Aug. 01, 2022	Jul. 26, 2022	Dec. 31, 2021	Feb. 27, 2019	Jan. 09, 2012
Short-Term Debt						$ 20,609,000				$ 26,789,000
Long-Term Debt, Current Maturities						266,106,000				63,745,000
Long-Term Debt, Excluding Current Maturities						66,788,000				247,527,000
Debt, Long-Term and Short-Term, Combined Amount						$ 353,503,000				$ 338,061,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 11.7				$ 11.7
Warrants and Rights Outstanding, Term (Year)						4 years 10 days				4 years 9 months 10 days
Proceeds from Issuance of Debt						$ 29,246,000	$ 12,534,000
Secured Debt						0				$ 169,826,000
AAFK [Member] | Warrants in Connection With Subordinated Notes [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									113							113
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 0.01							$ 0.01
Warrants and Rights Outstanding, Term (Year)									2 years							2 years
Third Eye Capital [Member] | Chief Executive Officer [Member]
Amount Guaranteed by Related Party		$ 10,000,000
Third Eye Capital [Member] | Revolving Credit Facility [Member]
Short-Term Debt					$ 18,000,000	33,500,000
Debt Issuance Costs, Net						$ 200,000
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate					13.75%	21.00%
Third Eye Capital [Member] | Acquisition Term Notes [Member]
Debt Instrument, Face Amount					$ 15,000,000
Revolving Notes Series B [Member] | Revolving Credit Facility [Member]
Short-Term Debt						$ 81,600,000
Debt Issuance Costs, Net						$ 500,000
Revolving Notes Series B [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		13.75%				21.00%
Term Loan [Member] | Third Eye Capital [Member]
Debt Instrument, Face Amount					7,200,000
Revenue Participation Term Notes [Member] | Third Eye Capital [Member]
Debt Instrument, Face Amount					$ 10,000,000
Short-Term Debt						$ 12,300,000
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Debt Issuance Costs, Net						57,800
Term Notes [Member] | Third Eye Capital [Member]
Short-Term Debt						7,300,000
Debt Instrument, Interest Rate, Stated Percentage					14.00%
Debt Issuance Costs, Net						36,200
Acquisition Term Notes [Member] | Third Eye Capital [Member]
Short-Term Debt						27,100,000
Debt Issuance Costs, Net						$ 100,000
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member]
Debt Instrument, Redemption Fee									$ 7,500,000
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate					10.75%	18.00%
Fuels Revolving Line [Member] | GAFI [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage				15.00%
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member]
Short-Term Debt						$ 47,100,000								$ 41,700,000
Debt Instrument, Basis Spread on Variable Rate				11.00%
Carbon Revolving Line [Member] | ACCI [Member]
Debt Issuance Costs, Net						400,000				1,100,000
Long-Term Debt, Current Maturities						29,200,000				2,500,000
Long-Term Debt, Excluding Current Maturities										24,900,000
Carbon Revolving Line [Member] | ACCI [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage				8.00%
Carbon Revolving Line [Member] | Prime Rate [Member] | ACCI [Member]
Debt Instrument, Basis Spread on Variable Rate				4.00%
Cilion Shareholder Seller Notes Payable [Member]
Debt Instrument, Face Amount					$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage					3.00%
Debt, Long-Term and Short-Term, Combined Amount						7,407,000			$ 7,400,000	7,242,000
Subordinated Notes [Member] | AAFK [Member]
Short-Term Debt						20,900,000				19,400,000
Debt Issuance Costs, Net						300,000				0
Debt Instrument, Fee Amount																$ 3,400,000
Debt Instrument Fee Rate																10.00%
Debt Extension Fee, Percentage																10.00%
EB5 Phase I Notes [Member]
Debt, Long-Term and Short-Term, Combined Amount						34,800,000				34,600,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)															$ 30
EB-5 Promissory Notes [Member]
Debt, Long-Term and Short-Term, Combined Amount						39,297,000				41,615,000
Proceeds from Issuance of Debt								$ 4,000,000
EB5 Phase II Notes [Member]
Debt, Long-Term and Short-Term, Combined Amount						4,500,000				4,500,000
Secunderabad Oils [Member]
Short-Term Debt						$ 0				5,100,000
Debt Instrument, Interest Rate, Stated Percentage													18.00%
Debt Agreement, Maximum Borrowing Capacity													$ 3,600,000
Leo Edibles & Fats Limited [Member]
Debt Agreement, Maximum Borrowing Capacity												$ 1,270,000
India Biodiesel Factoring Arrangement [Member]
Debt Instrument, Interest Rate, Stated Percentage						8.10%
Proceeds from Issuance of Secured Debt						$ 23,000,000
Secured Debt						0				0
Construction Loan Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage			9.25%
Debt, Long-Term and Short-Term, Combined Amount						48,961,000				48,235,000
Debt Agreement, Maximum Borrowing Capacity			$ 25,000,000
Long-Term Debt						24,600,000				25,100,000
Construction Loan Agreement [Member] | US Treasury (UST) Interest Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			5.00%
Construction Loan Agreement 2 [Member]
Debt Instrument, Interest Rate, Stated Percentage	8.75%
Debt Issuance Costs, Net						800,000
Debt Agreement, Maximum Borrowing Capacity	$ 25,000,000
Long-Term Debt						25,100,000				23,900,000
Construction Loan Agreement 2 [Member] | US Treasury (UST) Interest Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	5.00%
Jessup Land Acquisition Notes [Member]
Debt Instrument, Face Amount											$ 840,000
Debt Instrument, Interest Rate, Stated Percentage											11.99%
Long-Term Debt						$ 550,000				$ 840,000

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