XML 53 R47.htm IDEA: XBRL DOCUMENT v2.4.0.6
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) (USD $)
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Number of Ethanol Entities Under Ownership Interest 4    
Number of State Under Which Real Estate Portfolio Manage 11    
Number of Reportable Segments 2    
Maximum Maturity Period of Short Term Investments 3 months    
Concentration Risk Number of Customer 4 3 2
Concentration Risk, Percentage 81.00% 78.00% 45.00%
Inventory Write-down $ 466,000 $ 153,000  
Property, Plant and Equipment, Depreciation Methods Depreciation is computed using the straight-line method    
Impairment of Real Estate 562,000 1,227,000 1,021,000
Estimated Cash Flow Percentage 25.00%    
EstimatedFutureCashFlowsTerms six    
Depreciation 16,081,000 11,721,000 15,800,000
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting 20.00%    
Interest Costs Capitalized 0 0 0
Interest Paid 4,449,000 3,174,000 4,701,000
Derivative Settlement on Interest Rate Swap 1,816,000 2,436,000 2,477,000
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, Total Intrinsic Value 1,800,000 3,200,000 700,000
Tax Benefit from Stock Options Exercised 200,000 1,200,000 300,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 0    
Building and Building Improvements [Member] | Minimum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 15    
Building and Building Improvements [Member] | Maximum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 40    
Fixtures And Equipment [Member] | Minimum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 3    
Fixtures And Equipment [Member] | Maximum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 20    
Customer Concentration Risk [Member]
      
Concentration Risk, Percentage 80.00% 58.00%  
Cost of Sales [Member]
      
Impairment of Real Estate 419,000 1,227,000 89,000
Discontinued Operation [Member]
      
Impairment of Real Estate $ 143,000   $ 932,000
Minimum [Member]
      
Extended Period of Warranty 12 months    
Maximum [Member]
      
Extended Period of Warranty 60 months