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10. Stock-Based Compensation (Details) (Employee Stock Plan, USD $)	3 Months Ended
	Mar. 31, 2015
Employee Stock Plan
Shares Available for Grant, Beginning	5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Shares Available for Grant, Authorized	200AMTX_NumberOfShareAuthorized / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Shares Available for Grant, Granted	(25)AMTX_NumberOfSharesGranted / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Shares Available for Grant, Exercised	0AMTX_NumberOfSharesExercised / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Shares Available for Grant, Forfeited/Expired	43AMTX_NumberOfSharesForfeitedexpired / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Shares Available for Grant, Ending	223us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Number of Shares Outstanding, Beginning	1,015AMTX_NumberOfSharesOutstandingBeginning / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Number of Shares Authorized	0AMTX_NumberOfSharesAuthorized / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Number of Shares Granted	25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Number of Shares Exercised	(71)AMTX_NumberOfSharesExercised1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Number of Shares Forfeited/Expired	(43)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Number of Shares Outstanding, Ending	926AMTX_NumberOfSharesOutstandingEnding / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Weighted Average Exercise Price Outstanding, Beginning	$ 5.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Weighted Average Exercise Price Authorized	$ 0.00AMTX_WeightedAverageExercisePriceAuthorized / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Weighted Average Exercise Price Granted	$ 3.88us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Weighted Average Exercise Price Exercised	$ 2.12us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Weighted Average Exercise Price Forfeited/Expired	$ 2.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember
Weighted Average Exercise Price Outstanding, Ending	$ 5.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = AMTX_EmployeeStockPlanMember

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Weighted average price of options that were either forfeited or expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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