Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 102,964	$ 90,685	$ 294,606	$ 270,282
Distillery Products
Disaggregation of Revenue [Line Items]
Sales	81,622	73,295	236,813	221,895
Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	21,342	17,390	57,793	48,387
Premium beverage alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	50,727	41,965	137,281	126,286
Brown goods | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	34,365	26,606	88,975	79,054
White goods | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	16,362	15,359	48,306	47,232
Industrial alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	19,461	19,525	64,032	60,604
Food grade alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	70,188	61,490	201,313	186,890
Fuel grade alcohol | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	1,274	1,438	3,970	4,337
Distillers feed and related co-products | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	6,119	6,630	19,889	19,906
Warehouse services | Distillery Products
Disaggregation of Revenue [Line Items]
Sales	4,041	3,737	11,641	10,762
Specialty wheat starches | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	11,604	8,432	30,938	22,523
Specialty wheat proteins | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	7,994	6,166	20,372	15,884
Commodity wheat starches | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	1,596	2,300	5,247	7,575
Commodity wheat proteins | Ingredient Solutions
Disaggregation of Revenue [Line Items]
Sales	$ 148	$ 492	$ 1,236	$ 2,405