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11. Agreements (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Agreements Details |  |  |  |
Ethanol sales | $ 27,242,694 | $ 31,064,699 | $ 32,739,882 | $ 63,117,908
Wet distiller's grains sales | 6,321,953 | 8,109,315 | 8,005,737 | 15,941,056
Corn oil sales | 455,184 | 166,509 | 630,227 | 166,509
Corn purchases | 26,145,005 | 37,646,472 | 31,519,323 | 74,431,277
Milo purchases | 4,648,364 |  | 4,648,364 |
Accounts receivable | 1,578,206 | 890,716 | 1,578,206 | 890,716
Accounts payable | $ 2,096,112 | $ 3,097,956 | $ 2,096,112 | $ 3,097,956

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