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1. Nature of Activities and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Sales | $ 201,998 | $ 171,526
North America |  |
Sales | 154,148 | 150,045
North America | Ethanol sales |  |
Sales | 114,593 | 113,855
North America | Wet distiller's grains sales |  |
Sales | 34,510 | 32,362
North America | Other sales |  |
Sales | 5,045 | 3,828
India |  |
Sales | 47,850 | 21,481
India | Other sales |  |
Sales | 2,577 | 5
India | Biodiesel sales |  |
Sales | 42,464 | 17,009
India | Refined Glycerin sales |  |
Sales | $ 2,809 | $ 4,467

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