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5. Operating Leases (Details) (USD $)	Jun. 30, 2012
Operating Leases Details
2012	$ 12,797,556
2013	11,520,331
2014	14,744,076
Total	$ 39,061,963

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Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Name:	AMTX_OperatingLeases2013
Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Name:	AMTX_OperatingLeases2014
Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Name:	AMTX_OperatingLeasesDetailsAbstract
Namespace Prefix:	AMTX_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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Name:	AMTX_OperatingLeasesTotal
Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant