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Segment Reporting (Details) - Schedule Of Segment Assets - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Segment Reporting Information [Line Items]    
Assets $ 471,393 $ 478,864
Additions to other long lived assets:    
Additions to other long lived assets:   796
Additions to property and equipment:    
Additions to property and equipment: 10,775 24,017
Ethanol [Member]    
Segment Reporting Information [Line Items]    
Assets 393,691 384,997
Additions to other long lived assets:    
Additions to other long lived assets:   796
Additions to property and equipment:    
Additions to property and equipment: 10,697 24,017
Refined Coal [Member]    
Segment Reporting Information [Line Items]    
Assets 8,625 12,165
Additions to property and equipment:    
Additions to property and equipment: 78  
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Assets $ 69,077 $ 81,702