Derivatives (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Derivatives (Textual) [Abstract]
Maximum period in which contracts for the sale of grain to processors or other consumers extend (years)	1 year
Estimated fair value of inventory	$ 0	$ 0.3	$ 0.7