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1. Nature of Activities and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Sales | $ 42,807 | $ 39,480
North America |  |
Sales | 42,328 | 35,872
North America | Ethanol and high-grade alcohol sales |  |
Sales | 29,920 | 25,322
North America | Wet distiller's grains sales |  |
Sales | 11,035 | 8,374
North America | Other sales |  |
Sales | 1,373 | 2,176
India |  |
Sales | 479 | 3,608
India | Other sales |  |
Sales | 5 | 13
India | Biodiesel sales |  |
Sales | 358 | 2,793
India | Refined Glycerin sales |  |
Sales | 116 | 90
India | PFAD sales |  |
Sales | $ 0 | $ 712

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