Inventories, Net - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule of Inventory [Line Items]
Inventory pledged as collateral	$ 0	$ 3,016,425

Pledged Assets, Not Separately Reported, Inventories

No definition available.

Name:	amcf_PledgedAssetsNotSeparatelyReportedInventories
Namespace Prefix:	amcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant