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Note 4 - Debt (Details Textual) - USD ($)									3 Months Ended		12 Months Ended		17 Months Ended
	Jan. 01, 2023	Jul. 01, 2022	Mar. 02, 2022	Jan. 01, 2022	Feb. 27, 2019	Jul. 10, 2017	Jul. 06, 2012	Mar. 04, 2011	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Mar. 06, 2023	Oct. 04, 2022	Aug. 08, 2022	Aug. 01, 2022	Jul. 26, 2022	May 11, 2022	Mar. 08, 2022	Nov. 05, 2021	Aug. 09, 2021	Mar. 14, 2021	Dec. 31, 2020	May 01, 2020	Mar. 06, 2020	Nov. 21, 2019	Jul. 15, 2017	Jan. 09, 2012	Jan. 06, 2012	Nov. 30, 2008
Long-Term Debt, Total											$ 246,240,000		$ 246,240,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)											$ 15.92	$ 2.59	$ 15.92											$ 2.59
Warrants and Rights Outstanding, Term (Year)											7 years 5 months 23 days	3 years 11 months 12 days	7 years 5 months 23 days											4 years 11 months 12 days
Short-Term Debt, Total											$ 36,754,000	$ 14,586,000	$ 36,754,000
Debt, Long-Term and Short-Term, Combined Amount, Total											246,240,000	188,767,000	246,240,000
Other Long-Term Debt, Noncurrent											$ 11,678,000	12,038,000	$ 11,678,000
Stock Issued Under Fuels Revolving Line [Member]
Stock Issued During Period, Shares, New Issues (in shares)			100,000
Five Year Warrants in Connection With New Credit Facility [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)											$ 10.20		$ 10.20
Warrants and Rights Outstanding, Term (Year)											5 years		5 years
Ten Year Warrants in Connection With New Credit Facility [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)											$ 20.00		$ 20.00
Warrants and Rights Outstanding, Term (Year)											10 years		10 years
Third Eye Capital [Member] | Five Year Warrants in Connection With New Credit Facility [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			50,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 10.20
Third Eye Capital [Member] | Ten Year Warrants in Connection With New Credit Facility [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 20.00
AAFK [Member] | Warrants in Connection With Subordinated Notes [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.01		$ 0.01																									$ 0.01
Warrants and Rights Outstanding, Term (Year)		2 years		2 years																									2 years
Class of Warrant or Right, Issued (in shares)		113,000		113,000
Subsequent Event [Member] | AAFK [Member] | Warrants in Connection With Subordinated Notes [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.01
Class of Warrant or Right, Issued (in shares)	113,000
Revolving Credit Facility [Member]
Repayments of Long-Term Lines of Credit			$ 16,000,000.0
Property Taxes Payment			6,100,000
Revolving Credit Facility [Member] | GAFI [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 10,000,000
Revolving Credit Facility [Member] | Prime Rate [Member] | GAFI [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate						7.75%
Revolving Credit Facility [Member] | Prime Rate [Member] | GAFI [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate						12.00%
Capital Revolving Credit Facility Fuels And Carbon Lines [Member] | GAFI and ACCI [Member]
Line of Credit Facility, Maximum Borrowing Capacity			100,000,000
Fuels Revolving Line [Member] | GAFI [Member]
Line of Credit Facility, Maximum Borrowing Capacity			50,000,000
Carbon Revolving Line [Member] | ACCI [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 50,000,000
Third Eye Capital [Member]
Payments of Financing Costs, Total					$ 100,000
Third Eye Capital [Member] | Mr. McAfee [Member]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk											$ 8,000,000.0		$ 8,000,000.0
Third Eye Capital [Member] | Revolving Credit Facility [Member]
Debt Instrument, Face Amount							$ 18,000,000.0
Third Eye Capital [Member] | Revolving Credit Facility [Member] | AAFK [Member]
Long-Term Debt, Total											61,600,000		61,600,000
Debt Issuance Costs, Net, Total											$ 1,000,000.0		$ 1,000,000.0
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage											21.25%		21.25%
Debt Instrument, Basis Spread on Variable Rate							13.75%
Third Eye Capital [Member] | Acquisition Term Notes [Member]
Debt Instrument, Face Amount							$ 15,000,000.0
Third Eye Capital [Member] | Reserve Liquidity Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage											30.00%		30.00%
Line of Credit Facility, Current Borrowing Capacity											$ 50,000,000.0		$ 50,000,000.0
Long-Term Debt, Total											$ 0		$ 0
Term Loan [Member] | GAFI [Member]
Debt Instrument, Face Amount						$ 15,000,000
Debt Instrument, Interest Rate, Stated Percentage						10.00%
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							$ 10,000,000.0
Debt Instrument, Interest Rate, Stated Percentage											5.00%		5.00%
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] | AAFK [Member]
Long-Term Debt, Total											$ 12,000,000.0		$ 12,000,000.0
Debt Issuance Costs, Net, Total											$ 69,000		$ 69,000
Short-term Credit Facility for Working Capital [Member] | Third Eye Capital [Member]
Proceeds from Lines of Credit, Total					$ 2,100,000				$ 600,000	$ 700,000
Debt Instrument, Interest Rate, Stated Percentage					14.00%
Amendment No. 19 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																							$ 100,000
Debt Instrument, Extension Fee, Percent of Note Indebtedness																							1.00%
Amendment No. 20 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																						$ 300,000
Debt Instrument, Extension Fee, Percent of Note Indebtedness																						1.00%
Debt Instrument, Restrictive Covenants													$100,000
Amendment No. 21 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																					$ 100,000
Amendment No. 22 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																				$ 100,000
Amendment No. 22 [Member] | Third Eye Capital [Member] | Subsequent Event [Member]
Debt Instrument, Fee Amount														$ 500,000
Amendment No. 23 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																			$ 100,000
Amendment No. 24 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																$ 300,000
Debt Instrument, Extension Fee, Percent of Note Indebtedness																1.00%
Amendment No. 25 [Member] | Third Eye Capital [Member] | Subsequent Event [Member]
Debt Instrument, Fee Amount														100,000
Reserve Liquidity Facility [Member] | Third Eye Capital [Member]
Debt Instrument, Face Amount																										$ 18,000,000
Line of Credit Facility, Maximum Borrowing Capacity																							$ 70,000,000.0
Line of Credit Facility, Current Borrowing Capacity																						$ 40,000,000.0
Debt Instrument, Non-refundable Standby Fee, Percent of Difference Between Principal Amount and the Commitment																										2.00%
Non Refundable Fees																										$ 500,000
Reserve Liquidity Facility [Member] | Third Eye Capital [Member] | Subsequent Event [Member]
Line of Credit Facility, Current Borrowing Capacity														$ 50,000,000
Reserve Liquidity Facility Paid Monthly in Arrears [Member] | Third Eye Capital [Member]
Debt Instrument, Interest Rate, Stated Percentage																										30.00%
Reserve Liquidity Facility Paid Monthly in Arrears [Member] | Third Eye Capital [Member] | Subsequent Event [Member]
Debt Instrument, Interest Rate, Stated Percentage														30.00%
Reserve Liquidity Facility if Event of Default Occurred and Continues [Member] | Third Eye Capital [Member]
Debt Instrument, Interest Rate, Stated Percentage																										40.00%
Reserve Liquidity Facility if Event of Default Occurred and Continues [Member] | Third Eye Capital [Member] | Subsequent Event [Member]
Debt Instrument, Interest Rate, Stated Percentage														40.00%
Term Notes [Member] | Third Eye Capital [Member]
Debt Instrument, Interest Rate, Stated Percentage											14.00%		14.00%
Long-Term Debt, Total											$ 7,200,000		$ 7,200,000
Debt Issuance Costs, Net, Total											27,000		27,000
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member]
Long-Term Debt, Total											26,700,000		26,700,000
Debt Issuance Costs, Net, Total											144,000		144,000
Debt Instrument, Redemption Fee											$ 7,500,000		$ 7,500,000
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate							10.75%				18.25%
Term Notes, Revolving Credit Facility and Acquisition Term Notes [Member] | Third Eye Capital [Member]
Debt Instrument, Fee, Percent of Carrying Value of Debt											1.00%		1.00%
Debt Instrument, Fee, Amount Allowed to be Paid in Cash, Percent											50.00%		50.00%
Debt Instrument, Fee, Amount Allowed to be Added to Debt Outstanding, Percent											50.00%		50.00%
Term Loan and Revolving Loan [Member] | GAFI [Member]
Debt Instrument, Fee Amount						$ 500,000
Fuels Revolving Line [Member] | GAFI [Member]
Debt Instrument, Interest Rate, Stated Percentage			10.00%								13.50%		13.50%
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member]
Debt Instrument, Basis Spread on Variable Rate			6.00%
Carbon Revolving Line [Member] | GAFI [Member]
Long-Term Debt, Total											$ 28,900,000		$ 28,900,000
Debt Issuance Costs, Net, Total											$ 1,500,000		$ 1,500,000
Carbon Revolving Line [Member] | ACCI [Member]
Debt Instrument, Interest Rate, Stated Percentage			8.00%								11.50%		11.50%
Long-Term Debt, Total											$ 25,100,000		$ 25,100,000
Debt Issuance Costs, Net, Total											2,400,000		2,400,000
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, Interest Rate, Stated Percentage							3.00%
Debt, Long-Term and Short-Term, Combined Amount, Total											6,821,000	6,619,000	6,821,000
Cilion Shareholder Seller Notes Payable [Member] | Aemetis Facility Keyes, Inc. [Member]
Long-Term Debt, Total											6,800,000		6,800,000
Subordinated Notes [Member] | AAFK [Member]
Debt Instrument, Fee Amount																													$ 2,500,000	$ 900,000
Debt Instrument Fee Rate																													10.00%
Debt Extension Fee, Percentage																													10.00%
Short-Term Debt, Total											15,900,000	14,300,000	15,900,000
Subordinated Notes 1 [Member]
Debt, Long-Term and Short-Term, Combined Amount, Total											15,931,000	14,304,000	15,931,000
Subordinated Notes 1 [Member] | AAFK [Member]
Debt Instrument, Face Amount		$ 90,000
Debt Instrument, Cash Extension Fee				$ 90,000
Subordinated Notes 1 [Member] | Subsequent Event [Member] | AAFK [Member]
Debt Instrument, Cash Extension Fee	$ 90,000
Subordinated Notes 2 [Member] | AAFK [Member]
Debt Instrument, Face Amount		$ 250,000
Debt Instrument, Cash Extension Fee				$ 250,000
Subordinated Notes 2 [Member] | Subsequent Event [Member] | AAFK [Member]
Debt Instrument, Cash Extension Fee	$ 250,000
EB5 Phase I Notes [Member]
Debt Instrument, Face Amount								$ 500,000
Long-Term Debt, Total											37,200,000		37,200,000
Debt Instrument, Term (Year)								4 years
Debt Instrument, Convertible, Conversion Price (in dollars per share)					$ 30
Debt Instrument, Amount Released From Escrow											35,500,000		35,500,000
Debt Instrument, Amount Remaining Funded to Escrow											500,000		500,000
Repayments of Debt											0	3,000,000.0
EB5 Phase I Notes [Member] | Minimum [Member]
Debt Instrument, Investment Raised Per Investor																									$ 500,000
EB5 Phase I Funding [Member]
Debt Instrument, Face Amount								$ 36,000,000.0
EB5 Phase I Funding [Member] | Maximum [Member]
Debt Instrument, Face Amount								$ 36,000,000.0
EB5 Phase II Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage																											3.00%
Debt Instrument, Amount Remaining Funded to Escrow											46,800,000		46,800,000
Debt Instrument, Principal Amount Sold											4,000,000.0		4,000,000.0
Debt, Long-Term and Short-Term, Combined Amount, Total											4,200,000		4,200,000
EB5 Phase II Notes [Member] | Minimum [Member]
Debt Instrument, Minimum Investment Raised Per Investor																											$ 500,000
EB5 Phase II Notes [Member] | Maximum [Member]
Debt Instrument, Minimum Investment Raised Per Investor																											$ 900,000
Debt Instrument, Investment Raised Per Investor																									900,000
Aggregate Principal Amount																									$ 50,800,000
Secunderabad Oils [Member]
Debt Instrument, Interest Rate, Stated Percentage																		18.00%										14.75%
Long-Term Debt, Total											0	0	0
First Priority Lien on Assets in Return, Percentage of Monthly Net Operating Profit																															30.00%
Debt Instrument, Fair Value Disclosure, Total																												$ 2,300,000
Debt Agreement, Maximum Borrowing Capacity																		$ 1,880,000
Leo Edibles & Fats Limited [Member]
Debt Agreement, Maximum Borrowing Capacity																	$ 1,270,000
Construction Loan Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage															5.95%
Long-Term Debt, Total											20,200,000		20,200,000
Debt Issuance Costs, Net, Total											300,000		300,000
Debt, Long-Term and Short-Term, Combined Amount, Total											19,820,000	$ 0	19,820,000
Debt Agreement, Maximum Borrowing Capacity															$ 25,000,000
Usda Annual Renewal Fee															0.25%
Financing Agreement For Capital Expenditures [Member]
Debt Instrument, Face Amount											5,700,000		5,700,000
Short-Term Debt, Total											1,000,000.0		1,000,000.0
Other Long-Term Debt, Noncurrent											$ 4,800,000		$ 4,800,000

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Amount of the cash extension fee that accompanies borrowing money under the debt instrument.

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Amount of extension fee of debt instrument as percentage of note indebtedness.

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Amount of fee allowed to be added to outstanding of debt under debt instrument as a percentage.

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Amount of principal amount that has been sold under debt instrument.

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Amount of first priority lien on assets in return as a percentage of monthly net operating profit.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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