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Note 4 - Debt (Details Textual) $ / shares in Units, GT in Millions										9 Months Ended
	Oct. 16, 2023 USD ($) shares	Sep. 30, 2023 USD ($) $ / shares shares	Aug. 01, 2023 USD ($)	Jul. 28, 2023 USD ($)	May 16, 2023 USD ($) $ / shares shares	Jan. 01, 2023 USD ($) $ / shares shares	Mar. 02, 2022 USD ($) $ / shares shares	Jul. 06, 2012 USD ($)	Mar. 04, 2011 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	May 04, 2023 USD ($) GT	Mar. 31, 2023	Mar. 06, 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								$ 11.78					$ 15.92
Long-Term Debt, Total		$ 286,534,000								$ 286,534,000
Proceeds from Issuance of Debt										41,449,000	$ 39,860,000
Short-Term Debt		42,415,000								42,415,000					$ 36,754,000
Long-Term Debt, Current Maturities		$ 24,070,000								$ 24,070,000					$ 12,465,000
Warrants and Rights Outstanding, Term (Year)		6 years 1 month 24 days								6 years 1 month 24 days					7 years 5 months 23 days
Debt, Long-Term and Short-Term, Combined Amount		$ 286,534,000								$ 286,534,000					$ 246,240,000
Other Long-Term Debt, Noncurrent		20,288,000								20,288,000					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							$ 10.2
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
Ten Year Warrants in Connection With New Credit Facility [Member] | Third Eye Capital [Member] | Subsequent Event [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares	25,000
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
Property Taxes Payment							6,100,000
Revolving Credit Facility [Member] | Subsequent Event [Member]
Repayments of Long-Term Debt	$ 8,600,000
Capital Revolving Credit Facility Fuels And Carbon Lines [Member] | GAFI and ACCI [Member]
Debt Instrument, Fee Amount			$ 100,000
Line of Credit Facility, Maximum Borrowing Capacity							100,000,000
Proceeds from Issuance of Debt			$ 2,300,000
Fuels Revolving Line [Member] | GAFI [Member]
Line of Credit Facility, Maximum Borrowing Capacity							50,000,000
Fuels Revolving Line [Member] | GAFI [Member] | Subsequent Event [Member]
Line of Credit Facility, Current Borrowing Capacity	37,500,000
Repayments of Long-Term Debt	11,600,000
Carbon Revolving Line [Member] | ACCI [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 50,000,000
Third Eye Capital [Member] | Subsequent Event [Member]
Repayments of Long-Term Debt	50,200,000
Third Eye Capital [Member] | Mr. McAfee [Member]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk		$ 8,000,000								$ 8,000,000
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					80,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 2			$ 2					$ 2
Third Eye Capital [Member] | Revolving Credit Facility [Member]
Debt Instrument, Face Amount								$ 18,000,000
Long-Term Debt, Total		$ 27,900,000								$ 27,900,000
Debt Issuance Costs, Net		$ 1,100,000								$ 1,100,000
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Repayments of Long-Term Debt	8,600,000
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage		22.00%								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
Third Eye Capital [Member] | Revolving Notes Series B [Member]
Long-Term Debt, Total		$ 51,800,000								$ 51,800,000
Debt Issuance Costs, Net		$ 400,000								$ 400,000
Third Eye Capital [Member] | Revolving Notes Series B [Member] | Prime Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage		22.00%								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%								30.00%
Line of Credit Facility, Current Borrowing Capacity		$ 50,000,000								$ 50,000,000
Long-Term Debt, Total		$ 0								$ 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
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		$ 12,100,000								$ 12,100,000
Debt Issuance Costs, Net		106,000								106,000
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
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
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								7,200,000
Debt Issuance Costs, Net		$ 52,000								$ 52,000
Term Notes [Member] | Third Eye Capital [Member]
Debt Instrument, Interest Rate, Stated Percentage		14.00%								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%								50.00%
Debt Instrument, Fee Amount, Percent if Paid Through Common Stock of Extension Fee		110.00%								110.00%
Debt Instrument, Fee, Amount Allowed to be Added to Debt Outstanding, Percent		50.00%								50.00%
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member]
Long-Term Debt, Total		$ 26,900,000								$ 26,900,000
Debt Issuance Costs, Net		222,000								222,000
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		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								25,000,000
Debt Issuance Costs, Net		1,600,000								1,600,000
Short-Term Debt		11,000,000								11,000,000
Fuels Revolving Line [Member] | GAFI [Member] | Subsequent Event [Member]
Line of Credit Facility, Remaining Borrowing Capacity	12,500,000
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member]
Debt Instrument, Basis Spread on Variable Rate							6.00%
Fuels Revolving Line [Member] | Third Eye Capital [Member] | GAFI [Member] | Subsequent Event [Member]
Repayments of Long-Term Debt	$ 11,600,000
Carbon Revolving Line [Member] | ACCI [Member]
Debt Instrument, Interest Rate, Stated Percentage							8.00%
Line of Credit Facility, Current Borrowing Capacity		0								0
Long-Term Debt, Total		24,900,000								24,900,000
Debt Issuance Costs, Net		1,900,000								1,900,000
Short-Term Debt		500,000								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								8,100,000
Cilion Shareholder Seller Notes Payable [Member]
Debt Instrument, Face Amount								$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage								3.00%
Long-Term Debt, Total		7,000,000								7,000,000
Debt, Long-Term and Short-Term, Combined Amount		6,975,000								6,975,000					6,821,000
Subordinated Notes [Member] | AAFK [Member]
Debt Instrument, Fee Amount																												$ 2,500,000	$ 900,000
Short-Term Debt		16,700,000								16,700,000					15,900,000
Debt Instrument Fee Rate																												10.00%
Debt Extension Fee, Percentage																												10.00%
Subordinated Notes 1 [Member]
Short-Term Debt		16,737,000								16,737,000					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		37,700,000								37,700,000					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								35,500,000
Debt Instrument, Amount Remaining Funded to Escrow		500,000								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
EB5 Phase I Funding [Member] | Maximum [Member]
Debt Instrument, Face Amount									$ 36,000,000
EB5 Phase II Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage																										3.00%
Debt Instrument, Amount Remaining Funded to Escrow		46,500,000								46,500,000
Debt Instrument, Principal Amount Sold		4,000,000								4,000,000
Debt, Long-Term and Short-Term, Combined Amount		4,300,000								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								0					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		0								0					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																5.95%
Long-Term Debt, Total		23,900,000								23,900,000					20,200,000
Debt Issuance Costs, Net		0								0					300,000
Short-Term Debt		33,139,000								33,139,000					19,820,000
Debt Agreement, Maximum Borrowing Capacity																$ 25,000,000
Usda Annual Renewal Fee																0.25%
Construction Loan Agreement 2 [Member]
Debt Instrument, Interest Rate, Stated Percentage				8.75%
Long-Term Debt, Total		10,000,000								10,000,000					0
Debt Issuance Costs, Net		800,000								800,000					$ 0
Debt Agreement, Maximum Borrowing Capacity				$ 25,000,000
Construction Loan Agreement 2 [Member] | US Treasury (UST) Interest Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				5.00%
Financing Agreement For Capital Expenditures [Member]
Debt Instrument, Face Amount		5,700,000								5,700,000
Short-Term Debt		1,700,000								1,700,000
Other Long-Term Debt, Noncurrent		$ 4,100,000								$ 4,100,000

X

- Definition

Represents aggregate principal amount.

+ References

No definition available.

+ Details

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X

- Definition

Number of warrants or rights issued during a period of time.

+ References

No definition available.

+ Details

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- Definition

Represents maximum borrowing capacity under debt agreement.

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No definition available.

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X

- Definition

The percentage of debt extension fee.

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No definition available.

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X

- Definition

Represents amount released from Escrow under debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

Represents amount remaining funded to escrow under debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents extended fee rate added to balance outstanding under debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Amount of fee allowed to be paid in cash under debt instrument ad a percentage.

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No definition available.

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X

- Definition

The percent if paid through common stock of extension fee for debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

Represents fee as percentage of carrying value of the debt.

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No definition available.

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Period Type:	duration

X

- Definition

Represents investment raised per investor under debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Minimum Amount of investment raised per investor under debt instrument.

+ References

No definition available.

+ Details

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- Definition

Represents minimum production requirement for debt instrument.

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No definition available.

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X

- Definition

Represents non-refundable one-time Fees of debt instrument.

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No definition available.

+ Details

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- Definition

Represents non-refundable standby fee of debt instrument as a percentage of difference between principal amount outstanding and the commitment.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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X

- Definition

Represents redemption fee under debt instrument agreement.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents property taxes payment.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Represents the USDA annual renewal fee.

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No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

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

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No definition available.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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