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7. Agreements (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Agreements Details        
Ethanol sales $ 37,386,793 $ 42,333,207 $ 100,504,700 $ 64,236,601
Wet distiller's grains sales 10,665,481 7,742,711 26,606,536 11,857,903
Corn oil sales 501,991 0 668,500 0
Corn purchases 46,299,261 43,016,152 120,730,538 69,309,030
Accounts receivable $ 1,414,625 $ 538,143 $ 1,414,625 $ 538,143