SEGMENT REPORTING (Details) - Schedule Of Segment Results And Assets - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Net sales and revenue:		$ 121,164	$ 116,283	$ 343,051	$ 332,212
Segment gross profit (loss):		14,867	20,162	38,137	45,868
Income (loss) before income taxes:		9,259	17,214	23,734	35,740
Benefit (provision) for income taxes:		5,735	(5,740)	1,043	(11,771)
Segment profit (loss):		13,168	8,938	20,653	19,952
Sales of products:		120,971	116,283	342,858	332,212
Ethanol [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:		120,971	116,283	342,858	332,212
Segment gross profit (loss):		18,257	20,162	41,527	45,868
Income (loss) before income taxes:		15,554	17,682	31,807	37,294
Benefit (provision) for income taxes:		(4,379)	(5,917)	(9,712)	(12,331)
Segment profit (loss):		9,058	9,209	17,665	20,901
Sales of products:		96,296	90,702	276,553	259,266
Refined Coal [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:	[1]	193		193
Segment gross profit (loss):		(3,390)		(3,390)
Income (loss) before income taxes:		(5,684)		(5,684)
Benefit (provision) for income taxes:	[2]	9,918		9,918
Segment profit (loss):		4,520		4,520
Sales of products:		193		193
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes:		(611)	(468)	(2,389)	(1,554)
Benefit (provision) for income taxes:		196	177	837	560
Segment profit (loss):		(410)	(271)	(1,532)	(949)
Dried Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products:		16,703	19,551	45,325	55,551
Non-Food Grade Corn Oil [Member]
Segment Reporting Information [Line Items]
Sales of products:		6,041	5,074	15,359	13,658
Modified Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products:		1,889	853	5,557	3,400
Other Segments [Member]
Segment Reporting Information [Line Items]
Sales of products:		$ 42	$ 103	$ 64	$ 337

[1] The Company records sales in the refined coal segment net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.

[2] The Company records its tax provision/benefit based on an estimated annual rate adjusted for items recorded discretely which it estimates to be approximately negative 4%. As a result of the timing of the refined coal acquisition on August 10, 2017, the Company's effective tax rate for the quarter ended October 31, 2017 was a benefit of approximately 62%, which then results in a year to date effective rate of a benefit of approximately 4%.