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Derivatives (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Maximum period in which contracts for the sale of grain to processors or other consumers extend 1 year    
Estimated fair value of inventory $ 0 $ 0  
Amount reclassified from accumulated and other comprehensive income 400,000 $ 400,000 $ 500,000
Amount to be reclassified from accumulated and other comprehensive income in next twelve months (less than) 200,000.0    
Interest rate contract      
Derivative [Line Items]      
Notional amount of derivative 91,000,000    
Other current assets or liabilities | Interest rate contract      
Derivative [Line Items]      
Notional amount of derivative $ 28,000,000