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Note 4 - Debt (Details Textual) $ / shares in Units, GT in Millions	Jun. 30, 2023 USD ($) $ / shares shares	May 16, 2023 USD ($) $ / shares shares	Jan. 01, 2023 USD ($) $ / shares shares	Mar. 02, 2022 USD ($) $ / shares shares	Jul. 06, 2012 USD ($)	Mar. 04, 2011 USD ($)	May 04, 2023 USD ($) GT	Mar. 31, 2023 USD ($)	Mar. 06, 2023 USD ($)	Mar. 04, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares	Oct. 04, 2022 USD ($)	Aug. 08, 2022 USD ($)	Aug. 01, 2022 USD ($)	Jul. 26, 2022 USD ($)	May 11, 2022 USD ($)	Mar. 08, 2022 USD ($)	Aug. 09, 2021 USD ($)	Mar. 14, 2021 USD ($)	May 01, 2020 USD ($)	Mar. 06, 2020 USD ($)	Nov. 21, 2019 USD ($)	Feb. 27, 2019 $ / shares	Jan. 09, 2012 USD ($) $ / shares	Jan. 06, 2012 USD ($)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 11.78										$ 15.92
Long-Term Debt, Total	$ 267,753,000
Short-Term Debt	41,396,000										$ 36,754,000
Long-Term Debt, Current Maturities	$ 21,458,000										$ 12,465,000
Warrants and Rights Outstanding, Term (Year)	6 years 4 months 24 days										7 years 5 months 23 days
Debt, Long-Term and Short-Term, Combined Amount	$ 267,753,000										$ 246,240,000
Other Long-Term Debt, Noncurrent	11,528,000										11,678,000
Stock Issued Under Fuels Revolving Line [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				100,000
Five Year Warrants in Connection With New Credit Facility [Member] | Third Eye Capital [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares				50,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 10.20
Ten Year Warrants in Connection With New Credit Facility [Member] | Third Eye Capital [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares				250,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 20.00
Warrants in Connection With Subordinated Notes [Member] | AAFK [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 0.01																					$ 0.01
Warrants and Rights Outstanding, Term (Year)			2 years																					2 years
Class of Warrant or Right, Issued (in shares) | shares			113,000
Revolving Credit Facility [Member]
Repayments of Long-Term Lines of Credit				$ 16,000,000.0
Property Taxes Payment				6,100,000
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] | Mr. McAfee [Member]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 8,000,000.0
Third Eye Capital [Member] | Warrants in Association With Amendment No. 27 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares	80,000	80,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 2.00	$ 2.00
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	$ 25,000,000.0
Debt Issuance Costs, Net	$ 1,300,000
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage	22.00%
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] | Revolving Notes Series B [Member] | AAFK [Member]
Long-Term Debt, Total	$ 48,900,000
Debt Issuance Costs, Net	$ 500,000
Third Eye Capital [Member] | Revolving Notes Series B [Member] | Prime Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage	22.00%
Debt Instrument, Basis Spread on Variable Rate		13.75%
Third Eye Capital [Member] | Reserve Liquidity Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage	30.00%
Line of Credit Facility, Current Borrowing Capacity	$ 50,000,000.0
Long-Term Debt, Total	$ 0
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%
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] | AAFK [Member]
Long-Term Debt, Total	$ 12,100,000
Debt Issuance Costs, Net	130,000
Amendment No. 22 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount																	$ 100,000
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]
Debt Instrument, Fee Amount									$ 100,000
Amendment No. 26 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount							$ 100,000
Debt Instrument, Minimum Production Requirement (Gigaton) | GT							10
Amendment No. 27 [Member] | Third Eye Capital [Member]
Debt Instrument, Fee Amount		$ 500,000
Debt Instrument, Extension Fee, Percent of Note Indebtedness		1.00%
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
Debt Instrument, Non-refundable Standby Fee, Percent of Difference Between Principal Amount and the Commitment																					2.00%
Non Refundable Fees																					$ 500,000
Line of Credit Facility, Current Borrowing Capacity									$ 50,000,000									$ 40,000,000.0
Reserve Liquidity Facility Paid Monthly in Arrears [Member] | Third Eye Capital [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%
Term Notes [Member] | Third Eye Capital [Member]
Long-Term Debt, Total	7,200,000
Debt Issuance Costs, Net	$ 58,000
Term Notes [Member] | Third Eye Capital [Member]
Debt Instrument, Interest Rate, Stated Percentage	14.00%
Debt Instrument, Fee, Percentage of Carrying Value of the Debt	1.00%
Debt Instrument, Fee, Amount Allowed to be Paid in Cash, Percent	50.00%
Debt Instrument, Fee Amount, Percent if Paid Through Common Stock of Extension Fee	110.00%
Debt Instrument, Fee, Amount Allowed to be Added to Debt Outstanding, Percent	50.00%
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member]
Long-Term Debt, Total	$ 26,900,000
Debt Issuance Costs, Net	260,000
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	19.00%				10.75%
Fuels Revolving Line [Member] | GAFI [Member]
Debt Instrument, Interest Rate, Stated Percentage				10.00%
Long-Term Debt, Total	$ 25,000,000.0
Debt Issuance Costs, Net	1,800,000
Short-Term Debt	8,600,000
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member]
Debt Instrument, Basis Spread on Variable Rate				6.00%
Carbon Revolving Line [Member] | ACCI [Member]
Debt Instrument, Interest Rate, Stated Percentage				8.00%
Line of Credit Facility, Current Borrowing Capacity	0
Long-Term Debt, Total	24,900,000
Debt Issuance Costs, Net	2,100,000
Short-Term Debt	500,000
Carbon Revolving Line [Member] | Prime Rate [Member] | ACCI [Member]
Debt Instrument, Basis Spread on Variable Rate				4.00%
Carbon Revolving Line [Member] | GAFI [Member]
Long-Term Debt, Current Maturities	8,100,000
Cilion Shareholder Seller Notes Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage					3.00%
Debt, Long-Term and Short-Term, Combined Amount	6,923,000										6,821,000
Cilion Shareholder Seller Notes Payable [Member] | Aemetis Facility Keyes, Inc. [Member]
Long-Term Debt, Total	6,900,000
Subordinated Notes [Member] | AAFK [Member]
Debt Instrument, Fee Amount																								$ 2,500,000	$ 900,000
Short-Term Debt	16,800,000										15,900,000
Debt Instrument Fee Rate																								10.00%
Debt Extension Fee, Percentage																								10.00%
Subordinated Notes 1 [Member]
Short-Term Debt	16,765,000										15,931,000
Subordinated Notes 1 [Member] | AAFK [Member]
Debt Instrument, Cash Extension Fee			$ 90,000
Subordinated Notes 2 [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	37,500,000										37,200,000
Debt Instrument, Term (Year)						4 years
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares																							$ 30
Debt Instrument, Amount Released From Escrow	35,500,000
Debt Instrument, Amount Remaining Funded to Escrow	500,000
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
Debt Instrument, Principal Amount Sold								$ 4,000,000.0
Debt, Long-Term and Short-Term, Combined Amount	4,300,000										4,200,000
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
EB5 Phase II Notes [Member] | Minimum [Member]
Debt Instrument, Minimum Investment Raised Per Investor																						$ 500,000
Secunderabad Oils [Member]
Debt Instrument, Interest Rate, Stated Percentage															18.00%
Short-Term Debt											0
Debt Agreement, Maximum Borrowing Capacity															$ 1,880,000
Leo Edibles & Fats Limited [Member]
Debt Agreement, Maximum Borrowing Capacity														$ 1,270,000
IndusInd Bank and HDFC Bank Secured Loans [Member]
Short-Term Debt	660,000										0
IndusInd Bank and HDFC Bank Secured Loans [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage								8.00%
IndusInd Bank and HDFC Bank Secured Loans [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage								6.00%
Construction Loan Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage										9.00%		5.95%
Long-Term Debt, Total	22,700,000										20,200,000
Debt Issuance Costs, Net	0									$ 9,000	300,000
Short-Term Debt	22,721,000										$ 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
Short-Term Debt	1,200,000
Other Long-Term Debt, Noncurrent	$ 4,600,000

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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