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8. Outstanding Warrants (Details) (Warrants, USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Warrants |  |
Number Outstanding, Beginning | 470 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | 181 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Number of Warrants Granted | 148 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | 582 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Number of Warrants Exercised | (217)AMTX_NumberOfOptionsExercised / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | (264)AMTX_NumberOfOptionsExercised / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Number of Warrants Expired | (50)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | (29)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Number of Outstanding, Ending | 351 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | 470 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Weighted Average Exercise Price Outstanding, Beginning | $ 3.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | $ 2.70 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Weighted Average Exercise Price Granted | $ 0.01 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | $ 2.60 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Weighted Average Exercise Price Exercised | $ 1.32 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | $ 0.10 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Weighted Average Exercise Price Expired | $ 4.97 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | $ 11.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Weighted Average Exercise Price Outstanding, Ending | $ 3.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | $ 3.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember
Weighted Average Remaining Contractual Life (in years) Outstanding, Beginning | 4 years 10 months 6 days | 2 years 8 months 1 day
Weighted Average Remaining Contractual Life (in years) Outstanding, Ending | 2 years 8 months 9 days | 4 years 10 months 6 days

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- Definition NumberOfOptionsExercised + References No definition available. + Details
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Namespace Prefix: | AMTX_
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Balance Type: | na
Period Type: | duration

X
- Definition Custom Element. + References No definition available. + Details
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Namespace Prefix: | AMTX_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
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Balance Type: | na
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X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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X
- Definition 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 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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