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10. Stock Based Compensation (Details) (Employee Stock Plan, USD $) | 6 Months Ended
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Jun. 30, 2014
Employee Stock Plan |
Shares Available for Grant, Beginning | 74
Shares Available for Grant, Authorized | 100
Shares Available for Grant, Number of Shares Granted | (148)
Shares Available for Grant, Exercised | 0
Shares Available for Grant, Forfeited/Expired | 65
Shares Available for Grant, Ending | 91
Number of Shares Outstanding, Beginning | 913
Number of Shares Authorized |
Number of Shares Granted | 148
Number of Shares Exercised | (144)
Number of Shares Forfeited/Expired | (65)
Number of Shares Outstanding, Ending | 852
Weighted Average Exercise Price Outstanding, Beginning | $ 4.90
Weighted Average Exercise Price Authorized | $ 0
Weighted Average Exercise Price Granted | $ 4.20
Weighted Average Exercise Price Exercised | $ 1.60
Weighted Average Exercise Price Forfeited/Expired | $ 2.69
Weighted Average Exercise Price Outstanding, Ending | $ 5.56

X
- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
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- Definition Custom Element. + References No definition available. + Details
Name: | AMTX_WeightedAverageExercisePriceAuthorized
Namespace Prefix: | AMTX_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- 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 + Details
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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 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 + Details
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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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- 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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