Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Summary of Significant Accounting Policies (Textual) [Abstract]
Marketing balance payable	$ 33.2	$ 16.7
Property subject to or available for leases statutory life minimum	40 years
Property subject to or available for leases statutory life maximum	50 years
Property subject to or available for leases useful life minimum	10 years
Property subject to or available for leases useful life maximum	38 years
Accounts payable for grain	71.1	37.8
Intangible assets estimated useful life, minimum	5
Intangible assets estimated useful life, maximum	10
Accrued compensation liability	6.2	5.8
Research and development expense	0.8	1.8	1.4
Grants awarded				5
Grants received	0.3	0.9	0.9
Advertising expense	$ 4.0	$ 4.1	$ 4.0
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Asset estimated average useful life	16
Land [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life, minimum	3
Asset estimated useful life, maximum	20
Buildings and Storage Facilities [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life, minimum	20
Asset estimated useful life, maximum	30
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life, minimum	3
Asset estimated useful life, maximum	20
Software [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life, minimum	3
Asset estimated useful life, maximum	10