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Segment Reporting (Details) - Schedule Of Segment Assets - USD ($)
$ in Thousands
Oct. 31, 2019
Jan. 31, 2019
Segment Reporting Information [Line Items]    
Assets $ 493,572 $ 471,393
Ethanol [Member]    
Segment Reporting Information [Line Items]    
Assets 404,733 393,691
Refined Coal [Member]    
Segment Reporting Information [Line Items]    
Assets 6,554 8,625
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Assets $ 82,285 $ 69,077