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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
shares
Oct. 31, 2017
Dec. 31, 2017
Jan. 31, 2018
USD ($)
shares
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Number of Entities Under Ownership Interest (in Dollars)       $ 5    
Number of Consolidated Subsidiaries       4    
Number of Equity Method Investments       1    
Number of Reportable Segments   2   2 1  
Inventory Write-down (in Dollars)       $ 0 $ 0 $ 0
Property, Plant and Equipment, Depreciation Methods       Depreciation is computed using the straight-line method.    
Asset Impairment Charges (in Dollars)       $ 0 0 125,000
Depreciation (in Dollars)       21,462,000 19,519,000 18,638,000
Material Settlements of Forward Contracts (in Dollars)       0 0 0
Assets (in Dollars) $ 478,864,000     478,864,000 454,024,000 $ 414,685,000
Liabilities (in Dollars) $ 121,000     $ 121,000 $ 100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | shares 550,000     550,000    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   35.00% 33.80% 35.00% 35.00%
Other Comprehensive Income (Loss), Net of Tax (in Dollars)       $ 0    
Customer Concentration Risk [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Concentration Risk Number of Customer       6 5 4
Concentration Risk, Percentage       87.00% 83.00% 75.00%
Refined Coal [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Number of Entities Under Ownership Interest (in Dollars)       $ 5    
Assets (in Dollars) $ 12,165,000     $ 12,165,000    
Ethanol [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Number of Operating Segments       3    
Assets (in Dollars) $ 384,997,000     $ 384,997,000 $ 371,464,000 $ 348,779,000
Majority-Owned Subsidiary, Unconsolidated [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Number of Consolidated Subsidiaries       2    
Majority-Owned Subsidiary, Unconsolidated [Member] | Refined Coal [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Number of Operating Segments       1    
Majority-Owned Subsidiary, Unconsolidated [Member] | Ethanol [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Number of Operating Segments       2    
Accounts Receivable Balance [Member] | Customer Concentration Risk [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Concentration Risk, Percentage       89.00% 88.00%  
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    
Not Accounted For Under "Normal Purchases and Normal Sales" Scope [Member]            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]            
Assets (in Dollars)           $ 100,000
Liabilities (in Dollars)         $ 200,000