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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Number of Ethanol Entities Under Ownership Interest 4    
Number of State Under Which Real Estate Portfolio Manage 6    
Number of Reportable Segments 2    
Maximum Maturity Period of Short Term Investments 3 months    
Concentration Risk Number of Customer 4 4 3
Concentration Risk, Percentage 82.00% 81.00% 78.00%
Inventory Write-down $ 0 $ 466,000  
Property, Plant and Equipment, Depreciation Methods Depreciation is computed using the straight-line method    
Related Parties Amount in Cost of Sales 55,000    
Impairment of Real Estate 55,000 562,000 1,227,000
Estimated Cash Flow Percentage 25.00%    
EstimatedFutureCashFlowsTerms six    
Depreciation 16,915,000 16,081,000 11,721,000
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting 20.00%    
Interest Paid 3,492,000 4,449,000 3,174,000
Derivative Settlement on Interest Rate Swap 1,687,000 1,816,000 2,436,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 1,100,000 1,800,000 3,200,000
Deferred Tax Expense from Stock Options Exercised 400,000 200,000 1,200,000
Building and Building Improvements [Member] | Minimum [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 15    
Building and Building Improvements [Member] | Maximum [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 40    
Fixtures And Equipment [Member] | Minimum [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 3    
Fixtures And Equipment [Member] | Maximum [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 20    
Cost of Sales [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Impairment of Real Estate   133,000 11,000
Discontinued Operation [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Impairment of Real Estate   $ 429,000 $ 1,216,000
Customer Concentration Risk [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Concentration Risk, Percentage 91.00% 80.00%  
Minimum [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Extended Period of Warranty 12 months    
Maximum [Member]
      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]      
Extended Period of Warranty 60 months