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Segment Reporting (Tables)
 3 Months Ended
Apr. 30, 2019
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following table summarizes segment and other results and assets (amounts in thousands):

   Three Months Ended 
   April 30, 
   2019   2018 
Net sales and revenue:          
Ethanol and by-products  $104,453   $120,680 
Refined coal 1   122    140 
Total net sales and revenue  $104,575   $120,820 
Segment gross profit (loss):          
Ethanol and by-products  $6,115   $13,546 
Refined coal   (2,469)    (2,695) 
Total gross profit  $3,646   $10,851 
           
Income (loss) before income taxes:          
Ethanol and by-products  $3,205   $11,009 
Refined coal   (2,676)    (2,859) 
Corporate and other   (362)    (501) 
Total income before income taxes  $167   $7,649 
           
Benefit (provision) for income taxes:          
Ethanol and by-products  $(486)   $(1,420) 
Refined coal   3,946    3,999 
Corporate and other   88    124 
Total benefit for income taxes  $3,548   $2,703 
   Three Months Ended 
   April 30, 
   2019   2018 
Segment profit (loss) (net of noncontrolling interests):        
Ethanol and by-products  $1,709   $8,589 
Refined coal   1,386    1,271 
Corporate and other   (274)    (364) 
Net income attributable to REX common shareholders  $2,821   $9,496 
           
   Three Months Ended 
   April 30, 
   2019   2018 
Sales of products, ethanol and by-products segment:        
Ethanol  $77,618   $91,893 
Dried distillers grains   18,674    20,083 
Non-food grade corn oil   4,983    4,980 
Modified distillers grains   3,140    3,717 
Other   38    7 
Total  $104,453   $120,680 
           
Sales of products, refined coal segment:          
Refined coal  $122   $140 

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.
Assets [Member]  
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   April 30,
2019		   January 31,
2019		 
Assets:        
Ethanol and by-products  $412,849   $393,691 
Refined coal   8,283    8,625 
Corporate and other   71,360    69,077 
Total assets  $492,492   $471,393