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6. Commitments and Contingencies (Details Narrative) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Details Narrative
Rent expense	$ 426us-gaap_LeaseAndRentalExpense	$ 386us-gaap_LeaseAndRentalExpense	$ 220us-gaap_LeaseAndRentalExpense
Rent reimbursement	$ 124AMTX_RentReimbursement	$ 80AMTX_RentReimbursement

X

- Details

Name:	AMTX_Disclosure5.OperatingLeasesDetailsNarrativeAbstract
Namespace Prefix:	AMTX_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	AMTX_RentReimbursement
Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration