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REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 100,915	$ 102,964	$ 92,560	$ 99,082	$ 92,463	$ 90,685	$ 90,501	$ 89,096	$ 395,521	$ 362,745	$ 376,089
Distillery Products
Disaggregation of Revenue [Line Items]
Sales									317,458	297,233	314,055
Distillery Products | Brown Goods
Disaggregation of Revenue [Line Items]
Sales									125,059	107,190	125,857
Distillery Products | White Goods
Disaggregation of Revenue [Line Items]
Sales									64,347	62,862	62,574
Distillery Products | Premium beverage alcohol
Disaggregation of Revenue [Line Items]
Sales									189,406	170,052	188,431
Distillery Products | Industrial alcohol
Disaggregation of Revenue [Line Items]
Sales									80,682	79,833	80,650
Distillery Products | Food grade alcohol
Disaggregation of Revenue [Line Items]
Sales									270,088	249,885	269,081
Distillery Products | Fuel grade alcohol
Disaggregation of Revenue [Line Items]
Sales									5,630	5,949	6,347
Distillery Products | Distillers feed and related co-products
Disaggregation of Revenue [Line Items]
Sales									26,109	26,743	25,698
Distillery Products | Warehouse services
Disaggregation of Revenue [Line Items]
Sales									15,631	14,656	12,929
Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales									78,063	65,512	62,034
Ingredient Solutions | Specialty wheat starches
Disaggregation of Revenue [Line Items]
Sales									41,631	30,816	28,594
Ingredient Solutions | Specialty wheat proteins
Disaggregation of Revenue [Line Items]
Sales									26,960	22,359	21,098
Ingredient Solutions | Commodity wheat starch
Disaggregation of Revenue [Line Items]
Sales									7,630	9,628	9,223
Ingredient Solutions | Commodity wheat protein
Disaggregation of Revenue [Line Items]
Sales									$ 1,842	$ 2,709	$ 3,119

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