Consolidated Condensed Financial Statements (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Oct. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2017
Consolidated Condensed Financial Statements (Details) [Line Items]
Number of Consolidated Subsidiaries		4
Number of Reportable Segments	2		2	1
Ethanol [Member]
Consolidated Condensed Financial Statements (Details) [Line Items]
Number of Operating Segments		3
Ethanol [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]
Consolidated Condensed Financial Statements (Details) [Line Items]
Number of Operating Segments		2
Refined Coal [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]
Consolidated Condensed Financial Statements (Details) [Line Items]
Number of Operating Segments		1