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1. Nature of Activities and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Disaggregation of revenue |
North America (in thousands) |
|  | For the year ended December 31, |
|  | 2018 |  |  | 2017 |
Ethanol sales |  | $ | 113,855 |  |  | $ | 106,419 |
Wet distiller's grains sales |  |  | 32,362 |  |  |  | 26,422 |
Other sales |  |  | 3,828 |  |  |  | 3,898 |
|  | $ | 150,045 |  |  | $ | 136,739 |
India (in thousands) |  |  |  |  |  |
|  | For the year ended December 31, |
|  | 2018 |  |  | 2017 |
Biodiesel sales |  | $ | 17,009 |  |  | $ | 10,365 |
Refined Glycerin sales |  |  | 4,467 |  |  |  | 3,053 |
Other sales |  |  | 5 |  |  |  | - |
|  | $ | 21,481 |  |  | $ | 13,418 |
Schedule of dilutive securities |
|  | As of |
|  | December 31, 2018 |  |  | December 31, 2017 |
Series B preferred (post split basis) |  |  | 132 |  |  |  | 132 |
Common stock options and warrants |  |  | 2,984 |  |  |  | 2,519 |
Debt with conversion feature at $30 per share of common stock |  |  | 1,236 |  |  |  | 1,201 |
SARs conversion if stock issued at $0.71 per share to cover $2.1 million |  |  | 2,964 |  |  |  | - |
Total number of potentially dilutive shares excluded from the diluted net loss per share calculation |  |  | 7,316 |  |  |  | 3,852 |

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