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1. Nature of Activities and Summary of Significant Accounting Policies (Details Narrative) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Disclosure1.NotesOfActivitiesAndSummaryOfSignificantAccountingPoliciesDetailsAbstract
Repayment of funds received	$ 500AMTX_RepaymentOfFundsReceived	$ 800AMTX_RepaymentOfFundsReceived
Carrying amount of debt obligations	66,700us-gaap_DebtInstrumentFaceAmount
Debt fair value	$ 67,700us-gaap_LongTermDebtFairValue

X

- Details

Name:	AMTX_Disclosure1.NotesOfActivitiesAndSummaryOfSignificantAccountingPoliciesDetailsAbstract
Namespace Prefix:	AMTX_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	AMTX_RepaymentOfFundsReceived
Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant