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Note 13 - Segment Information Expected volatility Note 16 - Income Tax us-gaap_LiabilitiesCurrent Total current liabilities Note 1 - Nature of Activities and Summary of Significant Accounting Policies - Schedule of Dilutive Securities (Details) Note 1 - Nature of Activities and Summary of Significant Accounting Policies - Schedule of Dilutive Securities (Details) (Parentheticals) Note 2 - Cash, Cash Equivalents, and Restricted Cash - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) Other current liabilities Note 3 - Inventories - Schedule of Inventories (Details) Expected life (years) (Year) Note 4 - Property, Plant and Equipment - Schedule of Property, Plant, and Equipment (Details) Note 4 - Property, Plant and Equipment - Depreciation of Property, Plant, and Equipment (Details) Tax credit sale receivable Nontrade Receivables, Current Note 5 - Debt - Schedule of Debt (Details) Note 5 - Debt - Maturities of Long-term Debt (Details) Note 6 - Leases - Lease Cost (Details) Note 6 - Leases - Non-cash Flow Information Related to ROU Asset and Lease Liabilities (Details) Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) (Parentheticals) Note 6 - Leases - Maturities of Leases (Details) amtx_LeaseTerm Lease Term (Year) Represents lease term. Note 6 - Leases - Lease Income (Details) Note 6 - Leases - Future Minimum Lease Payments (Details) Note 8 - Equity - Schedule of Stock by Class (Details) Note 8 - Equity - Schedule of Stock by Class (Details) (Parentheticals) Supplemental Balance Sheet Information Related to Leases [Table Text Block] Tabular disclosure of supplemental balance sheet information related to leases. Note 9 - Warrants to Purchase Common Stock - Schedule of Warrants or Rights (Details) Note 9 - Warrants to Purchase Common Stock - Fair Value Assumptions (Details) Note 10 - Stock-Based Compensation - Schedule of Share-based Payment Award (Details) Foreign currency translation loss Foreign currency translation loss Note 10 - Stock-Based Compensation - Share-Based Compensation Arrangement by Share-Based Payment Award, Options Vested and Expected to Vest, Outstanding, and Exercisable (Details) Accretion of the lease liability Represents operating lease liability accretion. Note 10 - Stock-Based Compensation - Fair Value Assumptions (Details) Note 11 - Revenue and Accounts Receivable - Disaggregation of Revenue (Details) Note 11 - Revenue and Accounts Receivable - Schedule Of America By Product Category (Details) Note 12 - Agreements - Schedule of Working Capital Agreement Activity (Details) us-gaap_DebtCurrent Short term debt Note 13 - Segment Information - Schedule of Segment Reporting Information (Details) Note 16 - Income Tax - Schedule of Components of Income Tax Expense (Benefit) (Details) Note 16 - Income Tax - Schedule of Income Before Income Tax, Domestic and Foreign (Details) Vested and Exercisable, remaining contractual term (Year) Note 16 - Income Tax - Schedule of Effective Tax Rate Reconciliation (Details) Lease Term [Table Text Block] Tabular disclosure of lease term. Note 16 - Income Tax - Schedule of Deferred Tax Assets and Liabilities (Details) Current portion of long term debt Note 16 - Income Tax - Open Tax Years by Major Tax Jurisdiction (Details) Note 16 - Income Tax - Cash Taxes Paid (Details) Notes To Financial Statements Vested and Exercisable, number of shares (in shares) Notes To Financial Statements [Abstract] Vested and Exercisable, weighted average exercise price (in dollars per share) Vested and Exercisable, aggregate intrinsic value us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) Remaining contractual term (Year) Aggregate intrinsic value Fair value per share on grant date (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) Expired, Weighted - Average Exercise Price (in dollars per share) Exercise price per share of warrants or rights expired during period. amtx_ClassOfWarrantOrRightExpiredDuringPeriod Expired, warrants (in shares) The number of warrants or rights expired during period. 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Tax free income - Sale of tax credits Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the sale of tax credits. Options Granted, Weighted-Average Exercise Price (in dollars per share) Tax free income - Sale of tax credits, percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the sale of tax credits. Exercised, Weighted-Average Exercise Price (in dollars per share) Sale of Section 48 Energy Tax Credits, percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the sale of tax credits. ITC credits monetized (reported within Income tax expense (benefit) The value of ITC credits monetized. Renewable Energy, Biodiesel [Member] Product or service, or a group of similar products or similar services. PUPA Eleventh Amendment [Member] PUPA Eleventh Amendment Accounts payable Working capital Loan [Member] Represents working capital loans. Number of shares (in shares) Balance, outstanding (in shares) Balance, outstanding (in shares) Federal Fixed Asset Tax Basis Reduction - Tax Credits, percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Schedule of Cash Taxes Paid and Received [Table Text Block] Tabular disclosure of cash taxes paid and received. amtx_CreditAgreementVariableRate Credit Agreement, Variable Rate The variable rate for the credit agreement. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod Forfeited/expired, outstanding (in shares) Income tax expense (benefit) Income tax expense (benefit) Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod Common stock issued (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Balance, Shares Available for Grant (in shares) Balance, Shares Available for Grant (in shares) Allocation of overhead expenses Allocation of corporate overhead expenses to segments The value of the corporate overhead expense allocated to segments. 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Restricted cash Basis of Presentation and Significant Accounting Policies [Text Block] Award Type [Axis] Common Units [Member] Represents common units. California Energy Commission Grant for Solar Microgrid, DSC and Battery Backup System [Member] Represents California Energy Commission Grant for Solar Microgrid, DSC and Battery Backup System. California Energy Commission Grant for Mechanical Vapor Recompression System [Member] Represents California Energy Commission Grant for Mechanical Vapor Recompression System. us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less accumulated depreciation Machinery and equipment Furniture and fixtures Construction in progress Land Plant and buildings Revenue Participation Term Notes [Member] Represents Revenue Participation Term Notes. Term Notes [Member] represents Term Notes. Acquisition Term Notes [Member] Represents Acquisition Term Notes. Third Eye Capital [Member] Represents Third Eye Capital. Board of Directors [Member] Relating to the board of directors. Fair value of warrants issued to subordinated debt holders Represents the fair value of warrants issued in noncash financing activities. Sale of Section 48 Energy Tax Credits Sale of tax credits Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the sale of tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Other Current Assets Policy [Policy Text Block] Disclosure of accounting policy for other current assets. Income tax benefit Income tax benefit amtx_ProceedsFromSaleOfIncomeTaxCredits Proceeds from Sale of Income Tax Credits he amount of cash received during the period from the sale of unused tax credits. Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity Disclosure [Text Block] Variable Interest Entity [Table] Cash and cash equivalents Accretion and other expenses of Series A preferred units Third Eye Capital Term Notes [Member] Represents Third Eye Capital term notes. Third Eye Capital Revolving Credit Facility [Member] Represents Third Eye Capital revolving credit facility. amtx_DebtAgreementMaximumBorrowingCapacity Debt Agreement, Maximum Borrowing Capacity Represents maximum borrowing capacity under debt agreement. Amendment Flag Cilion Shareholder Seller Notes Payable [Member] Represents Cilion shareholder seller notes payable. Subordinated Notes 1 [Member] Represents subordinated notes 1. EB-5 Promissory Notes [Member] Represents EB-5 promissory notes. City Area Code Use of Estimates, Policy [Policy Text Block] Third Eye Capital Revenue Participation Term Notes [Member] Represents Third Eye Capital revenue participation term notes. New Accounting Pronouncements, Policy [Policy Text Block] Third Eye Capital Acquisition Term Notes [Member] Represents Third Eye Capital acquisition term notes. Third Eye Capital Fuels Revolving Line [Member] Represents Third Eye Capital fuels revolving line. Third Eye Capital Carbon Revolving Line [Member] Represents Third Eye capital carbon revolving line. Current Fiscal Year End Date Construction Loan Agreement 2 [Member] Represents construction loan agreement 2. Document Fiscal Period Focus Document Fiscal Year Focus Document Period End Date Entity File Number Entity Emerging Growth Company Document Type us-gaap_GainsLossesOnExtinguishmentOfDebt Gain on debt/liability extinguishment Entity Small Business Entity Shell Company Document Information [Line Items] Document Information [Table] Entity Public Float Entity Filer Category Entity Current Reporting Status Entity Voluntary Filers Entity Well-known Seasoned Issuer Loss on impairment of intangibles us-gaap_AccountsReceivableNet Accounts Receivable, after Allowance for Credit Loss us-gaap_ImpairmentOfLongLivedAssetsHeldForUse Impairment, Long-Lived Asset, Held-for-Use Award Timing MNPI Disclosure [Text Block] us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage ecd_AwardTmgMnpiCnsdrdFlag Award Timing MNPI Considered [Flag] Entity Tax Identification Number Entity Central Index Key Insider Trading Policies and Procedures [Line Items] Depreciation and amortization Entity Registrant Name ecd_InsiderTrdPoliciesProcAdoptedFlag Insider Trading Policies and Procedures Adopted [Flag] Entity [Domain] Customer Concentration Risk [Member] Legal Entity [Axis] Entity Address, Address Line One ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Intangibles and other amortization expense Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code Entity Address, State or Province Concentration Risk Type [Axis] ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss Concentration Risk Type [Domain] Material Terms of Trading Arrangement [Text Block] Entity Common Stock, Shares Outstanding Revenue, Segment Benchmark [Member] Trading Arrangements, by Individual [Table] Property held for development us-gaap_MarketingExpense Marketing Expense Trading Symbol Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Local Phone Number us-gaap_TableTextBlock Notes Tables us-gaap_GainLossOnDispositionOfAssets1 Gain (Loss) on asset disposals amtx_DebtInstrumentRedemptionFee Debt Instrument, Redemption Fee Represents redemption fee under debt instrument agreement. Selling, general and administrative expenses Bad debt expense Regulatory Income Taxes, Policy [Policy Text Block] Related Party Transaction [Axis] Related Party Transaction [Domain] Interest expense including amortization of debt fees Interest rate expense Debt related fees and amortization expense us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Substantial Doubt about Going Concern [Text Block] Inventory Disclosure [Text Block] Subsequent Event [Member] Schedule of Inventory, Current [Table Text Block] Inventory, Current [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Events [Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Term Loan On Equipment Purchase [Member] Represents Term Loan On Equipment Purchase. Interest expense Revenues us-gaap_Revenues Comprehensive Income, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] us-gaap_AssetsCurrent Total current assets Share-Based Payment Arrangement [Policy Text Block] Equity [Text Block] CDFAs[Member] Represents CDFA. CEC [Member] Represents CEC. amtx_MatchingContribution Matching Contribution Represents matching contribution. amtx_AwardedGrants Awarded Grants Represents awarded grants. LCFPP [Member] Represents LCFPP. Schedule of America by Product Category [Table Text Block] Tabular disclosure of schedule of America by product category. amtx_ActualExpensesIncurred Actual Expenses Incurred Represents actual expenses incurred. amtx_UnearnedGrantProceeds Unearned Grant Proceeds Represents unearned grant proceeds. Ethanol Sales [Member] Represents Ethanol sales. Biodiesel Sales [Member] Represents biodiesel sales. us-gaap_DeferredTaxAssetsValuationAllowance Valuation Allowance Commitments and Contingencies, Policy [Policy Text Block] Common Stock Options and Warrants [Member] Represents common stock options and warrants. Other current assets us-gaap_DeferredTaxAssetsNet Net Deferred Tax Assets Debt, Policy [Policy Text Block] us-gaap_DeferredTaxAssetsLiabilitiesNet Deferred Tax Assets, Net Net Deferred Tax Assets (Liabilities) Debt with Conversion Feature [Member] Represents debt with conversion feature. Prepaid expenses Depreciation Of Property, Plant, and Equipment [Table Text Block] Tabular disclosure of depreciation of property, plant, and equipment. Other, net us-gaap_DeferredTaxAssetsGross Total Deferred Tax Assets us-gaap_DeferredIncomeTaxLiabilities Total Deferred Tax Liabilities Shipping and Handling Costs [Policy Text Block] Disclosure of accounting policy for shipping and handling costs. Inventories Total inventories Carbon Revolving Line [Member] Represents Carbon Revolving Line. Work-in-progress Revenues Revenues Fuels Revolving Line [Member] Represents Fuels Revolving Line. Finished goods amtx_DebtInstrumentExtendedFeeRateAddedToBalanceOutstanding Debt Instrument Fee Rate Represents extended fee rate added to balance outstanding under debt instrument. Segment Reporting, All Other Segments, Including Corporate [Member] Related to all other segments including corporate segment. Fixed Asset Grants Raw materials EB5 Phase I Notes [Member] Represents E B5 Phase I Notes. Accrued Expenses Useful life (Year) Secunderabad Oils [Member] Represents Secunderabad Oils. EB5 Phase II Notes [Member] Represents EB5 Phase II Notes. Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] us-gaap_AccountsReceivableGrossCurrent Accounts receivable Furniture and Fixtures [Member] Accounts receivable us-gaap_NumberOfReportableSegments Number of Reportable Segments Grant proceeds received for capital expenditures Represents grant proceeds and other reimbursements received for capital expenditures. Stock Based Compensation Building [Member] Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment [Table] us-gaap_OtherNonoperatingIncomeExpense Other income Long-Lived Tangible Asset [Axis] Segment Reporting Disclosure [Text Block] Long-Lived Tangible Asset [Domain] Deffered tax assets, tax credit carryforwards NOLs, Unabsorbed Depreciation and R&D Credits C/F's Chief Executive Officer [Member] Current assets: Outstanding Warrants [Text Block] Disclosure of outstanding warrants. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Total cash, cash equivalents, and restricted cash shown in the statement of cash flows us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Inventory, Policy [Policy Text Block] Effect of exchange rate changes on cash and cash equivalents and restricted cash us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net change in cash and cash equivalents and restricted cash for period Energy [Axis] us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities us-gaap_OperatingIncomeLoss Operating loss us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by (used in) operating activities Energy [Domain] us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_DeferredTaxLiabilities Net Deferred Tax Assets (Liabilities) Corn purchases Gross profit (loss) Gross loss Cost of goods sold Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] us-gaap_InventoryWriteDown Inventory Write-down Operating and Finance Leases [Text Block] The entire disclosure for operating leases and finance leases. Natural Gas and Natural Gas Liquids (NGL) [Member] us-gaap_PaymentsOfStockIssuanceCosts Payments of Stock Issuance Costs us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment Property, Plant & Equipment Supplemental Non-cash Flow Information Related to Leases [Table Text Block] Tabular disclosure of supplemental non-cash flow information related to leases. Proceeds from the exercise of stock options Title and Position [Domain] Proceeds from sales of common stock State and Local tax expense, current Title and Position [Axis] Foreign tax expense, current Foreign tax expense, deferred Federal tax expense, current us-gaap_PaymentsForRepurchaseOfRedeemableConvertiblePreferredStock Payments on Series A preferred financing us-gaap_CurrentIncomeTaxExpenseBenefit Total tax expense, current Foreign amtx_IncreaseDecreaseInTaxCreditSaleReceivable Tax credit sale receivable Amount of increase (decrease) in tax credit sale receivables. us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Loss before income taxes United States Ministry of Finance, India [Member] ICFR Auditor Attestation Flag Other comprehensive loss State and Local Jurisdiction [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Internal Revenue Service (IRS) [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Domain] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Domestic Tax Jurisdiction [Member] Foreign Tax Jurisdiction [Member] Summary of Income Tax Examinations [Table Text Block] Revenue from Contract with Customer [Text Block] Accounts Receivable [Policy Text Block] Jessup Land Acquisition Notes [Member] Represents Jessup Land Acquisition Notes. Short Term Promissory Note [Member] Represents short term promissory note. us-gaap_RepaymentsOfOtherLongTermDebt Repayments of borrowings LCFS Credit Sales [Member] Represents LCFS Credit Sales. Accounting Policies [Abstract] Gas Sales [Member] Represents gas sales. Open tax year Basis of Accounting, Policy [Policy Text Block] RIN Sales [Member] Represents RIN Sales. Third Eye Capital Short Term Promissory Note [Member] Represents Third Eye Capital Short Term Promissory Note. amtx_OperatingLossCarryforwardsNotSubjectToExpiration Operating Loss Carryforwards Not Subject to Expiration Amount of operating loss carryforwards that are not subject to expiration dates. 2029 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour amtx_OperatingLossCarryforwardsSubjectToExpiration Operating Loss Carryforwards Subject to Expiration Amount of operating loss carryforwards that are subject to expiration. 2030 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive Thereafter us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive 2026 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths 2027 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo amtx_CreditAgreementInterestRate Credit Agreement, Interest Rate The interest rate for credit agreement. 2028 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree Government Assistance, Type [Axis] Government Assistance, Type [Domain] us-gaap_ProceedsFromIssuanceOfSecuredDebt Proceeds from Issuance of Secured Debt Grant Assistance [Text Block] The entire disclosure for assistance programs, including assistance from government and private companies. Government Assistance [Table] Capital expenditures Auditor Name Auditor Firm ID Auditor Location Term Loan [Member] Senior Secured Term Loan. us-gaap_TaxCreditCarryforwardAmount Tax Credit Carryforward, Amount Pledging Purpose [Domain] Market value per share on grant date (in dollars per share) Share Price (in dollars per share) Research Tax Credit Carryforward [Member] us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization Accumulated depreciation Investment Tax Credit Carryforward [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Diluted (in shares) us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Tax Credit Carryforward [Axis] Pledging Purpose [Axis] Tax Credit Carryforward, Name [Domain] Property and equipment, at cost us-gaap_OperatingLossCarryforwards Operating Loss Carryforwards AAFK [Member] Represents AAFK. us-gaap_OperatingLossCarryforwardsExpirationDate Operating Loss Carryforwards, Expiration Date Statement of Financial Position [Abstract] Diluted (in dollars per share) Basic (in shares) us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Other adjustments, percent GAFI [Member] GAFI. us-gaap_EffectiveIncomeTaxRateContinuingOperations Provision (Benefit) for Income Taxes, percent Effective Tax Rate Basic (in dollars per share) Protair-X and Third Eye Capital [Member] Represents Protair-X and Third Eye Capital. Changes in valuation allowances, percent Statement of Cash Flows [Abstract] Subordinated Notes [Member] Subordinated Notes. Statement of Stockholders' Equity [Abstract] ACCI [Member] ACCI. Changes in unrecognized tax benefits, percent Proceeds from borrowings Proceeds from Issuance of Debt Warrants in Connection With Subordinated Notes [Member] Warrants in Connection With Subordinated Notes. Interest on lease liabilities Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] us-gaap_FinanceLeaseLiabilityPaymentsDue Total lease payments, Finance leases us-gaap_FinanceLeaseRightOfUseAssetAmortization Amortization of right-of-use assets Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Other non-deductible expenses, percent Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount Less imputed interest, Finance leases Stock Compensation, percent 2029, Finance leases 2030, Finance leases Thereafter, Finance leases 2026, Finance leases 2027, Finance leases 2028, Finance leases Finance leases State and local income tax, net of federal (national) income tax effect *, percent Foreign tax effects, percent Asset Acquisition, Contingent Consideration, Liability, Current us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch R&D Tax Credit, percent Finance leases (in years) (Year) Other adjustments Financing activities: Tax at Federal Statutory Rate, percent us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes Prior year true-ups Changes in valuation allowances Valuation Allowance Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Changes in unrecognized tax benefits Pledged Status [Domain] Pledged Status [Axis] Amortization of right-of-use assets Property, plant and equipment, net Total net property, plant & equipment Other non-deductible expenses Other Class of Stock [Axis] Stock Compensation Stock-based compensation Interest expense carryover us-gaap_IncomeTaxReconciliationTaxCredits Credits State and local income tax, net of federal (national) income tax effect * State tax benefit Foreign tax effects Foreign tax differential us-gaap_IncomeTaxReconciliationTaxCreditsResearch R&D Tax Credit Tax at Federal Statutory Rate Income tax benefit at the federal statutory rate Income Tax Disclosure [Text Block] Schedule of Maturities of Long-Term Debt [Table Text Block] Schedule of Debt [Table Text Block] Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member] Represents Ethanol Sales, Wet Distillers Grain and Corn Oil Sales. Revolving Notes Series B [Member] Represents Revolving Notes Series B CDS Sales [Member] Represents CDS sales. Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] Revolving Credit Facility [Member] Credit Facility [Axis] Credit Facility [Domain] Settlement of Accounts Payable via issuance of common stock us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Capital expenditures Supplemental disclosures of cash flow information, non-cash transactions: Grantee Status [Domain] Grantee Status [Axis] us-gaap_IncomeTaxesPaidNet Received/(Paid) Weighted average shares outstanding Supplemental disclosures of cash flow information, cash paid: Operating lease expense Lease income us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Effect of cross-border tax laws Effective Income Tax Rate Reconciliation [Table] Effect of cross-border tax laws, percent Net loss Net loss amtx_PreferredUnitsAggregateRedemptionPriceIncrementalFee Preferred Units, Aggregate Redemption Price, Incremental Fee The incremental fee included in the aggregate redemption price of the preferred units. PUPA Ninth Amendment [Member] Represents the ninth amendment for the preferred unit purchase agreement. us-gaap_InterestCostsIncurredCapitalized Capitalized Interest Costs, Including Allowance for Funds Used During Construction Share-Based Payment Arrangement, Option [Member] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Investing activities: Net loss per common share Other liabilities us-gaap_IncreaseDecreaseInOtherOperatingLiabilities Related Party Transaction [Table] us-gaap_RelatedPartyTransactionAmountsOfTransaction Related Party Transaction, Amounts of Transaction Accrued interest expense and fees, net of interest paid Related Party Transactions Disclosure [Text Block] Production tax credits Government Assistance, Operating Income, Increase (Decrease) Accounts payable us-gaap_IncreaseDecreaseInAccountsPayable us-gaap_DebtInstrumentTerm Debt Instrument, Term (Year) PG&E SEM Incentive Program [Member] Represents PG&E SEM Incentive Program. us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived State and local - CA amtx_AmountGuaranteedByRelatedParty Amount Guaranteed by Related Party Amount guaranteed by related party. amtx_PropertyPlantAndEquipmentBeforeAccumulatedDepreciationAndAmortizationAndFinanceLeaseRightofuseAssetAfterAmortization Total gross property, plant & equipment Amount, before accumulated depreciation and amortization, of property, plant, and equipment and amount of finance lease right-of-use asset, after amortization. amtx_TaxCreditIncome Tax Credit Income Amount of tax credit income. us-gaap_IncomeTaxPaidForeignAfterRefundReceived Foreign EBITDA Amount of EBITDA. Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price (in dollars per share) Stock-based compensation expense Share-Based Payment Arrangement, Expense Credit Agreement [Member] Represents the credit agreement. us-gaap_ComprehensiveIncomeNetOfTax Comprehensive loss us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Common Stock, Shares Outstanding (in shares) us-gaap_PreferredStockSharesOutstanding Preferred Stock, Shares Outstanding (in shares) amtx_ForwardPurchaseAgreementFixedPriceEnergyMeasure Forward Purchase Agreement, Fixed Price, Energy Measure (Millions of British Thermal Unit) Nominal energy measure used to calculate payments on the forward purchase agreement at a fixed price. us-gaap_IncreaseDecreaseInOtherOperatingAssets Other assets us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Variable lease expense us-gaap_LeaseCost Total finance lease cost us-gaap_DebtInstrumentInterestRateEffectivePercentage Debt Instrument, Interest Rate, Effective Percentage Operating leases us-gaap_OperatingLeaseCost Total operating lease cost Short term lease expense Lease, Cost [Table Text Block] Finance lease right of use assets amtx_FinanceLeaseRightofuseAssetAfterAccumulatedAmortization Amount of finance lease right of use asset after amortization. Capital Unit, Class [Domain] amtx_ForwardPurchaseAgreementNymexIndexPrice Forward Purchase Agreement, NYMEX Index Price (in USD per Millions of British Thermal Unit) The NYMEX index price per unit for the forward purchase agreement. us-gaap_DebtLongtermAndShorttermCombinedAmount Combined debt Total debt, net of debt issuance costs us-gaap_IncreaseDecreaseInPrepaidExpense Prepaid expenses Operating leases (in years) (Year) us-gaap_DebtInstrumentFeeAmount Debt Instrument, Fee Amount us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Capital Units by Class [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] SIFMA Municipal Swap Rate [Member] Variable Rate [Domain] us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive 2030 us-gaap_LessorOperatingLeasePaymentsToBeReceivedAfterRollingYearFive Thereafter Prime Rate [Member] us-gaap_LessorOperatingLeasePaymentsToBeReceived Total future lease commitments us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths 2026 us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo 2027 Schedule of Long-Term Debt Instruments [Table] us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree 2028 Issuance and exercise of warrants Variable Rate [Axis] us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour 2029 us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Stock-based compensation Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] amtx_LenderDebtRenewalAndWaiverFeePayments Lender debt renewal and waiver fee payments The amount of lender debt renewal and waiver fee payments. Subordinated debt extension fees added to debt The amount of subordinated debt extension fees added to debt. Cumulative capital expenditures in accounts payable and accruals The amount of capital expenditures in accounts payable. us-gaap_StockRedeemedOrCalledDuringPeriodShares Stock Redeemed or Called During Period, Shares (in shares) Unpaid capital expenditures in construction financing The amount of capital expenditures purchased on financing. Lender debt extension, waiver, and other fees added to debt The amount of lender debt extension waiver and other fees added to debt. Operating Lease, Lease Income [Table Text Block] Issuance and exercise of warrants (in shares) The number of shares for issuance and exercise of warrants. us-gaap_IncreaseDecreaseInInventories Inventories us-gaap_ProceedsFromIncomeTaxRefundFederal U.S. Federal (see Note A) Stock options exercised (in shares) Exercised, outstanding (in shares) Stock options exercised Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Options Granted, shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Options Granted, shares (in shares) Mauritius Revenue Authority [Member] Relating to the Mauritius Revenue Authority. Warrants and Rights Outstanding, Measurement Input Outstanding, Average Remaining Term in Years (Year) Warrants and Rights Outstanding, Term (Year) Line of Credit Facility, Lender [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Issuance of common stock (in shares) Issuance of common stock for services Issuance of common stock for services (in shares) Lender Name [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders' deficit Issuance of common stock Asset Pledged as Collateral [Member] Accumulated deficit Accumulated other comprehensive loss Measurement Input, Share Price [Member] Debt Disclosure [Text Block] Measurement Input, Price Volatility [Member] Changes in operating assets and liabilities: Measurement Input, Risk Free Interest Rate [Member] Schedule of Cash and Cash Equivalents [Table Text Block] Measurement Input, Expected Dividend Rate [Member] us-gaap_OperatingLeaseLiabilityNoncurrent Long term operating lease liability Cash and Cash Equivalent [Table] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Measurement Input, Expected Term [Member] us-gaap_PreferredUnitsAuthorized Preferred Units, Authorized (in shares) us-gaap_PreferredUnitsIssued Preferred Units, Issued (in shares) Total operating lease liability Total operating lease liabilities Measurement Input, Exercise Price [Member] us-gaap_OperatingLeaseLiabilityCurrent Current portion of operating lease liability Cash and Cash Equivalents Disclosure [Text Block] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] us-gaap_FinanceLeaseLiabilityCurrent Other current liability Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] us-gaap_FinanceLeaseLiabilityNoncurrent Other long term liabilities Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating lease right-of-use assets us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease payments, Operating leases Financing cash flows used in finance leases Payments on finance leases us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less imputed interest, Operating leases Total finance lease liability Total finance lease liabilities Measurement Input Type [Axis] Measurement Input Type [Domain] us-gaap_FinanceLeaseRightOfUseAsset Property and equipment, net 2029, Operating leases 2030, Operating leases Thereafter, Operating leases Stock issued for services 2026, Operating leases Share-Based Payment Arrangement, Employee [Member] 2027, Operating leases 2028, Operating leases Share-based compensation us-gaap_AmortizationOfFinancingCostsAndDiscounts Debt related fees and amortization expense Preferred Units by Name [Axis] Preferred Units, Class [Domain] Depreciation Depreciation Equipment Financing [Member] Equipment Financing US Treasury (UST) Interest Rate [Member] Common stock, $0.001 par value; 80,000 authorized; 66,189 and 51,139 shares issued and outstanding each period, respectively Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Operating Agreement with Gemini Edibles and Fats India Private Limited [Member] Related to operating agreement with Gemini Edibles and Fats India Private Limited. Common Stock, Shares Authorized (in shares) Common Stock, Shares Authorized (in shares) Leo Edibles & Fats Limited [Member] Related to Leo Edibles & Fats Limited. Common Stock, Shares Issued (in shares) Construction Loan Agreement [Member] Related to construction loan agreement. Common Stock, Par Value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Schedule of Warrants, Valuation Assumptions [Table Text Block] Tabular disclosure for the valuation assumptions of warrants. Customer Three [Member] Related to customer three. Production Tax Credits [Policy Text Block] The policy for production tax credits. us-gaap_CommonStockCapitalSharesReservedForFutureIssuance Common Stock, Capital Shares Reserved for Future Issuance (in shares) Statistical Measurement [Domain] Lessee, Lease, Description [Table] Operating cash flows used in operating leases Maximum [Member] Minimum [Member] Product and Service [Axis] Product and Service [Domain] Statistical Measurement [Axis] Operating cash flows used in finance leases Cash paid for interest us-gaap_PreferredStockRedemptionAmount Preferred Stock, Redemption Amount Income taxes paid Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Table Text Block] us-gaap_PreferredStockSharesAuthorized Preferred Stock, Shares Authorized (in shares) us-gaap_PreferredStockParOrStatedValuePerShare Preferred Stock, Par or Stated Value Per Share (in dollars per share) us-gaap_ProceedsFromGrantors Proceeds from Grantors Customer [Axis] Customer [Domain] Operating activities: Revenue [Policy Text Block] Statement [Line Items] Additional paid-in capital AOCI Attributable to Parent [Member] Stockholders' deficit: CAL Fire [Member] Represents CAL Fire. CAL FIRE Business and Workforce Development Grant Program [Member] Represents CAL FIRE Business and Workforce Development Grant Program. Counterparty Name [Axis] Counterparty Name [Domain] Consolidation Items [Domain] us-gaap_ContractWithCustomerLiability Contract with Customer, Liability Consolidation Items [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] us-gaap_AccountsPayableCurrentAndNoncurrent Accounts Payable us-gaap_UndistributedEarningsOfForeignSubsidiaries Undistributed Earnings of Foreign Subsidiaries Cost of Goods and Service [Policy Text Block] Retained Earnings [Member] Additional Paid-in Capital [Member] Preferred Stock [Member] Equity Components [Axis] Equity Component [Domain] us-gaap_LongTermDebt Long-Term Debt Schedule of Stock by Class [Table Text Block] Stock, Class of Stock [Table] amtx_PolicyTable us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Outstanding, Weighted - Average Exercise Price (in dollars per share) Outstanding, Weighted - Average Exercise Price (in dollars per share) Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Other Assets [Member] Other Current Assets [Member] us-gaap_ClassOfWarrantOrRightOutstanding Outstanding, warrants (in shares) Outstanding, warrants (in shares) Class of Warrant or Right [Table] us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) Mr. McAfee [Member] Represents Mr. McAfee. us-gaap_DeferredFinanceCostsNet Debt Issuance Costs, Net us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet Debt issuance costs Senior secured notes and revolving notes Secured Debt Employment Agreements and Expense Reimbursements [Member] Represents employment agreements and expense reimbursements. Document Annual Report Machinery and Equipment [Member] Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Domain] us-gaap_ResultsOfOperationsTransportationCosts Oil and Gas, Result of Operation, Transportation Cost Entity Incorporation, State or Country Code us-gaap_DebtInstrumentCarryingAmount Total debt Document Transition Report Document Financial Statement Error Correction [Flag] Short term borrowings Short-Term Debt Entity Interactive Data Current Security Exchange Name Title of 12(b) Security Customer Two [Member] Represents customer two. amtx_NumberOfMajorCustomers Number of Major Customers Represents number of major customers. amtx_Gallonperyear GallonPerYear (Gallon) Represents amount of gallon per year. California Dairy Renewable Natural Gas [Member] Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity. California Ethanol [Member] Represents California Ethanol segment. India Biodiesel Segment [Member] Represents India Biodiesel. Customer One [Member] Represents customer one. Corn Purchases [Member] Represents corn purchases. Corn Oil Sales [Member] Represents corn oil sales. Wet Distiller's Grains Sales [Member] Represents wet distiller's grains sales. J.D. Heiskell [Member] Represents information a bout J.D. Heiskell. Collaborative Arrangement and Arrangement Other than Collaborative [Table] Nonmonetary Transaction Type [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement Disclosure [Text Block] Nonmonetary Transaction Type [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Table Text Block] Segments [Axis] Segments [Domain] amtx_DebtExtensionFeePercentage Debt Extension Fee, Percentage The percentage of debt extension fee. Fair Value per Warrant on Grant Date [Member] Measurement input using fair value per warrant on grant date. Ethanol Segment [Member] Ethanol Segment amtx_ClassOfWarrantOrRightExercisedDuringPeriod Exercised, warrants (in shares) The number of warrants or rights exercised during period. RNG Segment [Member] RNG Segment Granted, warrants (in shares) The number of warrants or rights granted during period. Statement [Table] Construction Loan Agreements [Member] Construction Loan Agreements MVRS Construction Financing Note [Member] MVRS Construction Financing Income Statement [Abstract] amtx_ShippingAndHandlingCosts Shipping and Handling Costs Amount of costs related to shipping and handling. Unvested, remaining contractual term (Year) Weighted average remaining contractual term for nonvested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. Unvested, aggregate intrinsic value Amount by which current fair value of underlying stock exceeds exercise price of unvested options outstanding. Carbon Oxide Sequestration Credit Carryforward [Member] Relating to carbon oxide sequestration credit carryforward. US Forest Service [Member] Represents US Forest Service. USDA Bioguel Producer Program [Member] Represents USDA Bioguel Producer Program. Alcohol and Cellulosic Biofuel Credit Carryforward [Member] Relating to alcohol and cellulosic biofuel credit carryforward. Operating Lease Liability Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from operating lease liabilities amtx_DeferredTaxLiabilitiesRightOfUseAsset Right of Use Asset Amount of deferred tax consequences attributable to taxable temporary differences derived from right-of-use assets. Ethanol Credits [Member] Relating to ethanol credits Accounting Standards Update and Change in Accounting Principle [Table] amtx_IncomeTaxReconciliationNondeductibleExpenseInterestExpenseAmount Interest Expense Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to interest expense deductions. Organizational Costs, Start-up and Intangible Assets Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from organizational costs, start-up, and intangible assets. Liabilities, Noncurrent Total long term liabilities Other long term liabilities Series A preferred units Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent India Biodiesel Factoring Arrangement [Member] Represents the India Biodiesel Factoring Arrangement. Exercised, Weighted - Average Exercise Price (in dollars per share) Exercise price per share of warrants or rights exercised during period. Granted, Weighted - Average Exercise Price (in dollars per share) Exercise price per share of warrants or rights granted during period. The 2019 Stock Plan [Member] Represents information about the 2019 Stock Plan. Forfeited/expired, shares available (in shares) Represents the number of shares no longer available for grant due to forfeitures and expirations during period. Aemetis Biogas LLC [Member] Relating to Aemetis Biogas LLC. us-gaap_StockholdersEquity Total stockholders' deficit Balance Balance Position [Domain] Long [Member] Other long term debt us-gaap_LongTermDebtNoncurrent Total long term debt Position [Axis] EB-5 notes Operating Segments [Member] Series A Preferred Stocks [Member] Represents series A Preferred Stocks. amtx_CommonUnitsIssuanceValue Common Units Issuance Value (in dollars per share) Represents common units issuance value. amtx_CommonUnitsAuthorized Common Units Authorized (in shares) Represents common units authorized. Preferred Units Series A [Member] Represents Preferred Units Series A. amtx_CommonUnitsIssued Common Units Issued (in shares) Represents common units issued.