Note 7 - Commitments (Detail) (USD $) In Thousands, unless otherwise specified		1 Months Ended	12 Months Ended
	Dec. 31, 2012	Jan. 31, 2012 Corn [Member]	Dec. 31, 2012 Natural Gas [Member]	Dec. 31, 2012 Flour [Member]	Dec. 31, 2012 Capital Expenditures [Member]
Long-term Purchase Commitment, Amount		$ 42,586	$ 5,576	$ 10,899
Purchase Commitment, Remaining Minimum Amount Committed					585
Letters of Credit Outstanding, Amount	$ 2,000