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9. Agreements (Tables) | 6 Months Ended
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Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of working capital agreement activity |
|  | As of and for the three months ended June 30, |  |  | As of and for the six months ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Ethanol sales |  | $ | 29,808 |  |  | $ | 30,129 |  |  | $ | 56,997 |  |  | $ | 58,341 |
Wet distiller's grains sales |  |  | 8,733 |  |  |  | 8,499 |  |  |  | 17,336 |  |  |  | 16,327 |
Corn oil sales |  |  | 852 |  |  |  | 893 |  |  |  | 1,652 |  |  |  | 1,816 |
Corn purchases |  |  | 30,719 |  |  |  | 28,760 |  |  |  | 59,980 |  |  |  | 56,505 |
Accounts receivable |  |  | 1,238 |  |  |  | 852 |  |  |  | 1,238 |  |  |  | 852 |
Accounts payable |  |  | 3,118 |  |  |  | 2,241 |  |  |  | 3,118 |  |  |  | 2,241 |

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