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11. Stock-Based Compensation (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Options |  |  |
Number of Outstanding, Ending | 926 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember | 913 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember |
Weighted Average Exercise Price Outstanding, Ending | $ 5.52 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember | $ 4.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember | $ 5.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember
Remaining Contractual Term (In Years) | 2 years 11 months 27 days | 2 years 9 months 15 days |
Average Intrinsic Value | $ 1,128 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember | $ 532 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_OptionMember |
Unvested Options |  |  |
Number of Outstanding, Ending | 367 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = AMTX_UnvestedOptionsMember | 397 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = AMTX_UnvestedOptionsMember |
Weighted Average Exercise Price Outstanding, Ending | $ 4.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementEquityComponentsAxis = AMTX_UnvestedOptionsMember | $ 5.70 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementEquityComponentsAxis = AMTX_UnvestedOptionsMember |
Remaining Contractual Term (In Years) | 3 years 10 months 13 days | 4 years 1 month 10 days |
Average Intrinsic Value | 356 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_StatementEquityComponentsAxis = AMTX_UnvestedOptionsMember | 9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_StatementEquityComponentsAxis = AMTX_UnvestedOptionsMember |
Vested Options |  |  |
Number of Outstanding, Ending | 559 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = AMTX_VestedOptionsMember | 516 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = AMTX_VestedOptionsMember |
Weighted Average Exercise Price Outstanding, Ending | $ 5.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementEquityComponentsAxis = AMTX_VestedOptionsMember | $ 4.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementEquityComponentsAxis = AMTX_VestedOptionsMember |
Remaining Contractual Term (In Years) | 2 years 4 months 28 days | 1 year 9 months 7 days |
Average Intrinsic Value | $ 772 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_StatementEquityComponentsAxis = AMTX_VestedOptionsMember | $ 523 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_StatementEquityComponentsAxis = AMTX_VestedOptionsMember |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + Details
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- 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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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