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9. Outstanding Warrants (Details 1) - Warrants - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Number of outstanding, beginning	330	344
Number of warrants granted	227	227
Number of warrants exercised	(227)	(241)
Number of warrants expired	(235)	0
Number of outstanding, ending	95	330
Weighted average exercise price outstanding, beginning	$ 3.47	$ 3.33
Weighted average exercise price granted	.01	0.01
Weighted average exercise price exercised	.01	0.01
Weighted average exercise price expired	3.82	0.01
Weighted average exercise price outstanding, ending	$ 2.59	$ 3.47
Weighted average remaining contractual life (in years) outstanding, beginning	3 years 7 days	3 years 10 months 17 days
Weighted average remaining contractual life (in years) outstanding, ending	6 years 11 months 12 days	3 years 7 days

X

- Definition

NumberOfOptionsExercised

+ References

No definition available.

+ Details

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Namespace Prefix:	AMTX_
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Balance Type:	na
Period Type:	duration

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

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- Definition

Custom Element.

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No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

+ Details

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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Period Type:	duration

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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X

- Definition

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

+ References

No definition available.

+ Details

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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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