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3. Property, Plant and Equipment (Details Narrative) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Property Plant And Equipment Details Narrative |  |  |  |
Depreciation expense | $ 1,153,167 | $ 419,549 | $ 2,318,422 | $ 764,466

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- Details
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Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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