Net Sales and Revenue (Details) - Schedule of Net Sales and Revenue for Each Product and Service Group - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenue from External Customer [Line Items]
Product or Service	$ 116,283	$ 110,584	$ 332,212	$ 329,261
Ethanol [Member]
Revenue from External Customer [Line Items]
Product or Service	90,702	82,767	259,266	248,329
Dried distillers grains [Member]
Revenue from External Customer [Line Items]
Product or Service	19,551	22,518	55,551	64,354
Non-food grade corn oil [Member]
Revenue from External Customer [Line Items]
Product or Service	5,074	3,994	13,658	12,002
Modified distillers grains [Member]
Revenue from External Customer [Line Items]
Product or Service	853	1,108	3,400	4,109
Other [Member]
Revenue from External Customer [Line Items]
Product or Service	$ 103	$ 197	$ 337	$ 467