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13. Related Party Transactions (Details Narrative) (Eric McAfee and McAfee Capital, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Eric McAfee and McAfee Capital
     
Related party debt $ 400us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= AMTX_EricMcAfeeMember
  $ 400us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= AMTX_EricMcAfeeMember
Related party transaction $ 27us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= AMTX_EricMcAfeeMember
$ 34us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= AMTX_EricMcAfeeMember