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7. Outstanding Warrants (Details) (Warrant [Member], USD $)	3 Months Ended
	Jun. 30, 2014	Mar. 31, 2014
Warrant [Member]
Number of Warrants Outstanding, Beginning	470	470
Number of Warrants Expired	(47)	0
Number of Warrants Granted	0	30
Number of Warrants Exercised	(54)	(30)
Number of Warrants Outstanding, Ending	369	470
Weighted Average Exercise Price Outstanding, Beginning	$ 3.41	$ 3.40
Weighted Average Exercise Price Expired	$ 4.98	$ 0
Weighted Average Exercise Price Granted	$ 0	$ 0.01
Weighted Average Exercise Price Exercised	$ 4.96	$ 0.01
Weighted Average Exercise Price Outstanding, Ending	$ 2.99	$ 3.41
Weighted Average Remaining Contractual Life (in years) Outstanding, Beginning	4 years 7 months 6 days	4 years 10 months 6 days
Weighted Average Remaining Contractual Life (in years) Outstanding, Ending	3 years 1 month 13 days

X

- Definition

NumberOfOptionsExercised

+ References

No definition available.

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- Definition

No authoritative reference available.

+ References

No definition available.

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- Definition

No authoritative reference available.

+ References

No definition available.

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Namespace Prefix:	AMTX_
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X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ 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)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Weighted average price of options that were either forfeited or expired.

+ 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)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ 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

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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

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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