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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Jan. 31, 2020
USD ($)
shares
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number Of Operating Entities 5    
Number of Reportable Segments 2   2
Inventory Write-down $ 1,300,000 $ 0 $ 0
Property, Plant and Equipment, Depreciation Methods Depreciation is computed using the straight-line method.    
Asset Impairment Charges $ 0 0 0
Depreciation 23,007,000 24,828,000 21,462,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ 0 $ 0 $ 0
Common Stock, Capital Shares Reserved for Future Issuance | shares 550,000    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   35.00%
Increase (Decrease) in Total Assets and Total Liabilities $ 20,900,000    
Minimum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Payment Term 5 days    
Maximum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Payment Term 10 days    
Ethanol [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number of Reportable Segments 3    
Ethanol [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number of Reportable Segments 2    
Refined Coal [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number of Reportable Segments 1    
Customer Concentration Risk [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Concentration Risk, Customer Eight six six
Concentration Risk, Percentage 85.00% 85.00% 87.00%
Percent of Accounts Receivable 88.00% 80.00%  
Contracts Not Accounted For Under Normal Purchases and Normal Sales      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Liabilities $ 230,000 $ 21,000  
Consolidated Entities [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number Of Operating Entities 4    
Equity Method Investee [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number Of Operating Entities 1    
Cost of Sales [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting 20.00%    
Building and Building Improvements [Member] | Minimum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 5    
Building and Building Improvements [Member] | Maximum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 40 years    
Fixtures And Equipment [Member] | Minimum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 2    
Fixtures And Equipment [Member] | Maximum [Member]      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 20 years