Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2020	Apr. 30, 2019
Segment Reporting Information [Line Items]
Net sales and revenue:		$ 83,250	$ 104,575
Segment gross profit (loss):		(9,330)	3,646
Income (loss) before income taxes:		(13,743)	167
Benefit (provision) for income taxes:		5,313	3,548
Segment profit (loss) (net of noncontrolling interests):		(7,635)	2,821
Sales of products, ethanol and by-products segment:		83,235	104,453
Ethanol [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:		83,235	104,453
Segment gross profit (loss):		(8,223)	6,115
Income (loss) before income taxes:		(12,351)	3,205
Benefit (provision) for income taxes:		4,161	(486)
Segment profit (loss) (net of noncontrolling interests):		(7,433)	1,709
Sales of products, ethanol and by-products segment:		60,597	77,618
Refined Coal [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:	[1]	15	122
Segment gross profit (loss):		(1,107)	(2,469)
Income (loss) before income taxes:		(847)	(2,676)
Benefit (provision) for income taxes:		959	3,946
Segment profit (loss) (net of noncontrolling interests):		150	1,386
Sales of products, ethanol and by-products segment:		15	122
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes:		(545)	(362)
Benefit (provision) for income taxes:		193	88
Segment profit (loss) (net of noncontrolling interests):		(352)	(274)
Dried Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		18,918	18,674
Non-Food Grade Corn Oil [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		3,188	4,983
Modified Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		457	3,140
Other Segments [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		$ 75	$ 38

[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.