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7. Stockholders Equity' (Details) | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Authorized Shares | 65,000 AMTX_AuthorizedSharesPreferred |
Shares Issued and Outstanding December 31, | 1,665 AMTX_SharesIssuedAndOutstandingPreferredStock | 2,401 AMTX_SharesIssuedAndOutstandingPreferredStock
Undesignated |  |
Authorized Shares | 57,765 AMTX_AuthorizedSharesPreferred / us-gaap_PreferredUnitsByNameAxis = AMTX_UndesignatedMember |
Shares Issued and Outstanding December 31, | 0 AMTX_SharesIssuedAndOutstandingPreferredStock / us-gaap_PreferredUnitsByNameAxis = AMTX_UndesignatedMember | 0 AMTX_SharesIssuedAndOutstandingPreferredStock / us-gaap_PreferredUnitsByNameAxis = AMTX_UndesignatedMember
Series B Preferred Stock |  |
Authorized Shares | 7,235 AMTX_AuthorizedSharesPreferred / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesBPreferredStockMember |
Shares Issued and Outstanding December 31, | 1,665 AMTX_SharesIssuedAndOutstandingPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesBPreferredStockMember | 2,401 AMTX_SharesIssuedAndOutstandingPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesBPreferredStockMember

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