10. Fair Value of Warrants (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Expected dividend yield	0.00%	0.00%
Risk-free interest rate	0.72%
Expected volatility	79.08%
Expected Life (years)		5 years
Exercise price	$ 0.001	$ 0.001
Company stock price	$ 0.70
Warrants \| Minimum
Risk-free interest rate		0.67%
Expected volatility		79.08%
Expected Life (years)	4 years 6 months
Company stock price		$ 0.40
Warrants \| Maximum
Risk-free interest rate		0.86%
Expected volatility		119.03%
Expected Life (years)	5 years
Company stock price		$ 0.73

Mandatorily redeemable Series B convertible preferred stock

No definition available.

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Namespace Prefix:	AMTX_
Data Type:	num:perShareItemType
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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	AMTX_
Data Type:	num:perShareItemType
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Period Type:	duration

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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