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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Net sales and revenue:		$ 123,750	$ 121,164	$ 373,327	$ 343,051
Segment gross profit (loss):		7,747	14,867	27,997	38,137
Income (loss) before income taxes:		3,755	9,259	16,263	23,734
Benefit (provision) for income taxes:		10,014	5,735	18,348	1,043
Segment profit (loss):		11,875	13,168	30,588	20,653
Sales of products, ethanol and by-products and refined coal segments:		123,546	120,971	372,717	342,858
Ethanol [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:		123,546	120,971	372,717	342,858
Segment gross profit (loss):		11,260	18,257	38,475	41,527
Income (loss) before income taxes:		8,405	15,554	29,491	31,807
Benefit (provision) for income taxes:		1,643	(4,379)	(1,806)	(9,712)
Segment profit (loss):		7,946	9,058	23,096	17,665
Sales of products, ethanol and by-products and refined coal segments:		91,538	96,296	283,720	276,553
Refined Coal [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:	[1]	204	193	610	193
Segment gross profit (loss):		(3,513)	(3,390)	(10,478)	(3,390)
Income (loss) before income taxes:		(4,240)	(5,684)	(11,887)	(5,684)
Benefit (provision) for income taxes:		8,318	9,918	19,914	9,918
Segment profit (loss):		4,260	4,520	8,549	4,520
Sales of products, ethanol and by-products and refined coal segments:		204	193	610	193
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes:		(410)	(611)	(1,341)	(2,389)
Benefit (provision) for income taxes:		53	196	240	837
Segment profit (loss):		(331)	(410)	(1,057)	(1,532)
Dried Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		24,683	16,703	65,826	45,325
Non-Food Grade Corn Oil [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		4,964	6,041	15,019	15,359
Modified Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		2,340	1,889	8,100	5,557
Other Segments [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		$ 21	$ 42	$ 52	$ 64
[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.

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