Basis of Presentation (Details) Other Balance Sheet and Income Statement Items (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Balance Sheet and Income Statement Items [Line Items]
Inventory, Raw Materials and Supplies, Gross	$ 5,300,000
Cost of canola oil and meal sold	34,174,000	44,662,000
Provision for Income Taxes:
Income tax provision (benefit)	265,000	784,000
Effective income tax rate	2.00%	4.00%
Statutory income tax rate	35.00%
Inventory, Finished Goods, Net of Reserves	7,100,000
Maximum
Provision for Income Taxes:
Likelihood uncertain tax percentage will be sustained	50.00%
Operating Expense [Member]
Other Balance Sheet and Income Statement Items [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount		2,100,000
Reduced Depreciation [Member]
Other Balance Sheet and Income Statement Items [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount		2,000,000
Scenario, Previously Reported [Member] | Reclassification of Labor and Overhead to Canola Oil and Meal Sold [Member]
Other Balance Sheet and Income Statement Items [Line Items]
Cost of canola oil and meal sold		$ 4,100,000