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Concentrations (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplier Concentration Risk | 2 Grain Suppliers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 29.00% | 29.00% | 31.00%
Supplier Concentration Risk | Pacific Ethanol |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 12.00% |  |
Supplier Concentration Risk | 10 Largest Suppliers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 68.00% | 65.00% | 63.00%
Net Sales | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 40.00% | 39.00% | 36.00%

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