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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Segment Reporting Information [Line Items]
Net sales and revenue:		$ 113,344	$ 123,750	$ 128,757	$ 120,820	$ 109,535	$ 121,164	$ 108,744	$ 113,143	$ 486,671	$ 452,586	$ 453,799
Segment gross profit (loss):		$ 2,218	$ 7,747	$ 9,399	$ 10,851	$ 6,024	$ 14,867	$ 10,781	$ 12,489	30,215	44,161	71,039
Income (loss) before income taxes:										14,588	25,393	56,911
Benefit (provision) for income taxes:										22,922	19,519	(17,393)
Segment profit (loss):										31,645	39,706	32,333
Sales of products, ethanol and by-products segment:										485,885	452,153	453,799
Interest income:										3,514	1,556	434
Depreciation expense:										24,828	21,462	19,519
Equity in income of unconsolidated affiliates:										1,536	3,232	6,144
(Loss) gain on sale of investment:											(13)	192
Ethanol [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:										485,885	452,153	453,799
Segment gross profit (loss):										43,856	51,509	71,039
Income (loss) before income taxes:										31,545	38,352	59,447
Benefit (provision) for income taxes:										(2,343)	3,245	(18,259)
Segment profit (loss):										23,346	35,880	33,950
Sales of products, ethanol and by-products segment:										368,319	359,239	358,349
Interest income:										2,460	878	212
Depreciation expense:										22,004	20,037	19,464
Equity in income of unconsolidated affiliates:										1,536	3,232	6,144
(Loss) gain on sale of investment:											(13)	192
Refined Coal [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:	[1]									786	433
Segment gross profit (loss):										(13,641)	(7,348)
Income (loss) before income taxes:										(15,204)	(10,021)
Benefit (provision) for income taxes:										24,674	15,168
Segment profit (loss):										10,148	5,628
Sales of products, refined coal segment:										786	433
Depreciation expense:										2,784	1,385
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes:										(1,753)	(2,938)	(2,536)
Benefit (provision) for income taxes:										591	1,106	866
Segment profit (loss):										(1,849)	(1,802)	(1,617)
Interest income:										1,054	678	222
Depreciation expense:										40	40	55
Dried Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:										85,417	63,120	71,204
Non-Food Grade Corn Oil [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:										20,097	21,195	18,518
Modified Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:										11,950	8,525	5,326
Other Segments [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:										$ 102	$ 74	$ 402
[1] Sales in the refined coal segment are recorded 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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