Business Acquisition (Details 1) (Amaizing Energy Denison LLC, USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Intangible assets acquisition
Fair value	4,335
Lease intangibles
Intangible assets acquisition
Fair value	4,085
Lease intangibles \| Minimum
Intangible assets acquisition
Intangible assets acquired useful life	10 months
Lease intangibles \| Maximum
Intangible assets acquisition
Intangible assets acquired useful life	4 years 6 months
Non-compete agreement
Intangible assets acquisition
Fair value	250
Intangible assets acquired useful life	2 years

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant