Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 99,082	$ 89,096
Distillery Products
Disaggregation of Revenue [Line Items]
Sales	80,002	74,577
Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	19,080	14,519
Premium beverage alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	45,972	42,009
Brown goods | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	29,070	24,827
White goods | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	16,902	17,182
Industrial alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	21,618	20,443
Food grade alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	67,590	62,452
Fuel grade alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	1,522	1,501
Distillers feed and related co-products | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	6,989	7,095
Warehouse services | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	3,901	3,529
Specialty wheat starches | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	10,212	6,881
Specialty wheat proteins | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	6,365	4,442
Commodity wheat starches | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	1,877	2,262
Commodity wheat proteins | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	$ 626	$ 934