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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Segment Reporting Information [Line Items]    
Net sales and revenue: $ 104,575 $ 120,820
Segment gross profit (loss): 3,646 10,851
Income (loss) before income taxes: 167 7,649
Benefit (provision) for income taxes: 3,548 2,703
Segment profit (loss): 2,821 9,496
Sales of products, ethanol and by-products and refined coal segments: 104,453 120,680
Ethanol [Member]    
Segment Reporting Information [Line Items]    
Net sales and revenue: 104,453 120,680
Segment gross profit (loss): 6,115 13,546
Income (loss) before income taxes: 3,205 11,009
Benefit (provision) for income taxes: (486) (1,420)
Segment profit (loss): 1,709 8,589
Sales of products, ethanol and by-products and refined coal segments: 77,618 91,893
Refined Coal [Member]    
Segment Reporting Information [Line Items]    
Net sales and revenue: [1] 122 140
Segment gross profit (loss): (2,469) (2,695)
Income (loss) before income taxes: (2,676) (2,859)
Benefit (provision) for income taxes: 3,946 3,999
Segment profit (loss): 1,386 1,271
Sales of products, ethanol and by-products and refined coal segments: 122 140
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Income (loss) before income taxes: (362) (501)
Benefit (provision) for income taxes: 88 124
Segment profit (loss): (274) (364)
Dried Distillers Grains [Member]    
Segment Reporting Information [Line Items]    
Sales of products, ethanol and by-products and refined coal segments: 18,674 20,083
Non-Food Grade Corn Oil [Member]    
Segment Reporting Information [Line Items]    
Sales of products, ethanol and by-products and refined coal segments: 4,983 4,980
Modified Distillers Grains [Member]    
Segment Reporting Information [Line Items]    
Sales of products, ethanol and by-products and refined coal segments: 3,140 3,717
Other Segments [Member]    
Segment Reporting Information [Line Items]    
Sales of products, ethanol and by-products and refined coal segments: $ 38 $ 7
[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.