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1. Nature of Activities and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Sales | $ 171,526 | $ 150,157
North America |  |
Sales | 150,045 | 136,739
North America | Ethanol sales |  |
Sales | 113,855 | 106,419
North America | Wet distiller's grains sales |  |
Sales | 32,362 | 26,422
North America | Other sales |  |
Sales | 3,828 | 3,898
India |  |
Sales | 21,481 | 13,418
India | Other sales |  |
Sales | 5 | 0
India | Biodiesel sales |  |
Sales | 17,009 | 10,365
India | Refined Glycerin sales |  |
Sales | $ 4,467 | $ 3,053

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