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Segment Reporting (Tables)
 9 Months Ended
Oct. 31, 2018
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
October 31,		   Nine Months Ended
October 31,
   2018   2017   2018   2017 
Net sales and revenue:                    
Ethanol and by-products  $123,546   $120,971   $372,717   $342,858 
Refined coal 1   204    193    610    193 
Total net sales and revenue  $123,750   $121,164   $373,327   $343,051 
Segment gross profit (loss):                    
Ethanol and by-products  $11,260   $18,257   $38,475   $41,527 
Refined coal   (3,513)   (3,390)   (10,478)   (3,390)
Total gross profit  $7,747   $14,867   $27,997   $38,137 
Income (loss) before income taxes:                    
Ethanol and by-products  $8,405   $15,554   $29,491   $31,807 
Refined coal   (4,240)   (5,684)   (11,887)   (5,684)
Corporate and other   (410)   (611)   (1,341)   (2,389)
Total income (loss) before income taxes  $3,755   $9,259   $16,263   $23,734 
Benefit (provision) for income taxes:                    
Ethanol and by-products  $1,643   $(4,379)  $(1,806)  $(9,712)
Refined coal   8,318    9,918    19,914    9,918 
Corporate and other   53    196    240    837 
Total benefit (provision) for income taxes  $10,014   $5,735   $18,348   $1,043 
Segment profit (loss) (net of noncontrolling interests):                    
Ethanol and by-products  $7,946   $9,058   $23,096   $17,665 
Refined coal   4,260    4,520    8,549    4,520 
Corporate and other   (331)   (410)   (1,057)   (1,532)
Net income attributable to REX common shareholders  $11,875   $13,168   $30,588   $20,653 
   Three Months Ended
October 31,		   Nine Months Ended
October 31,		 
   2018   2017   2018   2017 
Sales of products, ethanol and by-products segment:                
Ethanol  $91,538   $96,296   $283,720   $276,553 
Dried distillers grains   24,683    16,703    65,826    45,325 
Non-food grade corn oil   4,964    6,041    15,019    15,359 
Modified distillers grains   2,340    1,889    8,100    5,557 
Other   21    42    52    64 
Total  $123,546   $120,971   $372,717   $342,858 
                     
Sales of products, refined coal segment:                    
Refined coal  $204   $193   $610   $193 

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]
   October 31,
2018		   January 31,
2018		                 
Assets:                        
Ethanol and by-products  $407,094   $384,997                 
Refined coal   9,330    12,165                 
Corporate and other   59,692    81,702                 
Total assets  $476,116   $478,864