Consolidated Condensed Financial Statements (Details)	3 Months Ended
	Apr. 30, 2019
Consolidated Condensed Financial Statements (Details) [Line Items]
Number of Consolidated Subsidiaries	4
Number of Reportable Segments	2
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