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Outstanding Warrants (Details 1) - Warrants - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of outstanding, ending | 55 | 95 | 95 | 95
Number of warrants granted | 292 | 227 | 227 |
Number of warrants exercised | (332) | (227) | (227) |
Weighted average exercise price outstanding, ending | $ 2.59 | $ 2.59 | $ 2.59 | $ 2.59
Weighted average exercise price granted | 0.01 | 0.01 | 0.01 |
Weighted average exercise price exercised | $ 0.32 | $ 0.01 | $ 0.01 |
Weighted average remaining contractual life (in years) outstanding, ending | 3 years 11 months 12 days | 4 years 11 months 12 days | 5 years 11 months 12 days | 6 years 11 months 12 days

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- References No definition available. + Details
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Namespace Prefix: | amtx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
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Namespace Prefix: | amtx_
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Balance Type: | na
Period Type: | duration

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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Period Type: | duration

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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://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=120381028&loc=d3e5070-113901 + Details
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Period Type: | instant

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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. + Details
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Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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