Segment Reporting (Details) - Schedule Of Segment Assets - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 475,161	$ 500,502
Ethanol [Member]
Segment Reporting Information [Line Items]
Assets	400,180	408,746
Refined Coal [Member]
Segment Reporting Information [Line Items]
Assets	3,605	6,101
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 71,376	$ 85,655