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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Net sales and revenue:		$ 128,757	$ 108,744	$ 249,577	$ 221,887
Segment gross profit (loss):		9,399	10,781	20,250	23,270
Income (loss) before income taxes:		4,859	6,473	12,508	14,475
Benefit (provision) for income taxes:		5,631	(2,302)	8,334	(4,692)
Segment profit (loss):		9,217	2,941	18,713	7,485
Sales of products, ethanol and by-products and refined coal segments:		128,491	108,744	249,171	221,887
Ethanol [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:		128,491	108,744	249,171	221,887
Segment gross profit (loss):		13,669	10,781	27,215	23,270
Income (loss) before income taxes:		10,077	7,330	21,086	16,253
Benefit (provision) for income taxes:		(2,029)	(2,675)	(3,449)	(5,380)
Segment profit (loss):		6,561	3,419	15,150	8,561
Sales of products, ethanol and by-products and refined coal segments:		100,289	88,785	192,182	180,257
Refined Coal [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:	[1]	266		406
Segment gross profit (loss):		(4,270)		(6,965)
Income (loss) before income taxes:		(4,788)		(7,647)
Benefit (provision) for income taxes:		7,597		11,596
Segment profit (loss):		3,018		4,289
Sales of products, ethanol and by-products and refined coal segments:		266		406
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes:		(430)	(857)	(931)	(1,778)
Benefit (provision) for income taxes:		63	373	187	688
Segment profit (loss):		(362)	(478)	(726)	(1,076)
Dried Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		21,059	13,472	41,143	28,622
Non-Food Grade Corn Oil [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		5,075	4,726	10,055	9,318
Modified Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		2,043	1,748	5,760	3,667
Other Segments [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products and refined coal segments:		$ 25	$ 13	$ 31	$ 23
[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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