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15. Related Party Transactions (Details Narrative) (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
Eric McAfee and McAfee Capital |  |  |
Related party debt | $ 400 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember | $ 1,000 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember |
Related party transaction | 191 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember | 110 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember | 65 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember
Guarantee fee agreement | 172 AMTX_GuaranteeFeeAgreement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember |  |
Accured guarantee fee | 28 AMTX_AccuredGuaranteeFee / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_EricMcAfeeMember |  |
Laird Cagan |  |  |
Shares distributed to satisfy revolving line of credit debt | 1,200 AMTX_SharesDistributedToSatisfyRevolvingLineOfCreditDebt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_LairdCaganMember | 6,200 AMTX_SharesDistributedToSatisfyRevolvingLineOfCreditDebt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_LairdCaganMember |
Board Members |  |  |
Related party debt | 1,700 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_BoardMembersMember | 1,700 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_BoardMembersMember |
Related party transaction | $ 400 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_BoardMembersMember | $ 400 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_BoardMembersMember | $ 400 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = AMTX_BoardMembersMember

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- Definition Custom Element. + References No definition available. + Details
Name: | AMTX_AccuredGuaranteeFee
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
Name: | AMTX_GuaranteeFeeAgreement
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_AccountsPayableRelatedPartiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=AMTX_BoardMembersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=AMTX_EricMcAfeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=AMTX_LairdCaganMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |