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Segment Reporting (Details) - Schedule Of Segment Assets - USD ($) $ in Thousands | 12 Months Ended
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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

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