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Segment Reporting (Tables)
 12 Months Ended
Jan. 31, 2020
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following tables summarize segment and other results and assets (amounts in thousands):

   Fiscal Year
   2019  2018  2017
Net sales and revenue:               
Ethanol and by-products  $417,700   $485,885   $452,153 
Refined coal 1   334    786    433 
Total net sales and revenue  $418,034   $486,671   $452,586 
Segment gross profit (loss):               
Ethanol and by-products  $20,402   $43,856   $51,509 
Refined coal   (7,917)   (13,641)   (7,348)
Total gross profit  $12,485   $30,215   $44,161 
(Loss) income before income taxes:               
Ethanol and by-products  $8,469   $31,545   $38,352 
Refined coal   (7,778)   (15,204)   (10,021)
Corporate and other   (1,860)   (1,753)   (2,938)
Total (loss) income before income taxes  $(1,169)  $14,588   $25,393 
Benefit (provision) for income taxes:               
Ethanol and by-products  $1,528   $(2,343)  $3,245 
Refined coal   10,828    24,674    15,168 
Corporate and other   457    591    1,106 
Total benefit for income taxes  $12,813   $22,922   $19,519 
Segment profit (loss):               
Ethanol and by-products  $5,439   $23,346   $35,880 
Refined coal   3,391    10,148    5,628 
Corporate and other   (1,403)   (1,849)   (1,802)
Net income attributable to REX
common shareholders		  $7,427   $31,645   $39,706 
   Fiscal Year
   2019  2018  2017
Sales of products, ethanol and by-products segment:               
Ethanol  $321,434   $368,319   $359,239 
Dried distillers grains   71,755    85,417    63,120 
Non-food grade corn oil   17,135    20,097    21,195 
Modified distillers grains   7,240    11,950    8,525 
Other   136    102    74 
Total sales  $417,700   $485,885   $452,153 
Sales of products, refined coal segment:               
Refined coal  $334   $786   $433 
Interest income:               
Ethanol and by-products  $2,949   $2,460   $878 
Refined coal   —    —    — 
Corporate and other   1,171    1,054    678 
Total interest income  $4,120   $3,514   $1,556 
Depreciation expense:               
Ethanol and by-products  $20,182   $22,004   $20,037 
Refined coal   2,790    2,784    1,385 
Corporate and other   35    40    40 
Total depreciation expense  $23,007   $24,828   $21,462 
Equity in income of unconsolidated affiliates:                 
Ethanol and by-products  $1,392   $1,536   $3,232 
Refined coal   —    —    — 
Corporate and other   —    —    — 
Total equity in income of unconsolidated affiliates  $1,392   $1,536   $3,232 

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.
Assets [Member]  
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   January 31,
Assets:  2020  2019
Ethanol and by-products  $408,746   $393,691 
Refined coal   6,101    8,625 
Corporate and other   85,655    69,077 
Total assets
  $500,502   $471,393 
Additions to property and equipment:           
Ethanol and by-products  $3,776   $10,697 
Refined coal   —    78 
Corporate and other   —    — 
Total additions to property and equipment  $3,776   $10,775