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INVESTMENTS AND DEPOSITS (Tables)
 12 Months Ended
Jan. 31, 2013
Schedule of Equity Method Investments [Table Text Block] The following table summarizes equity method investments at January 31, 2013 and 2012 (amounts in thousands):
Entity   Ownership Percentage     Carrying Amount January 31, 2013     Carrying Amount January 31, 2012  
                   
Big River Resources, LLC     10 %   $ 32,438     $ 34,370  
Patriot Holdings, LLC     27 %     27,521       27,309  
                         
Total Equity Method Investments         $ 59,959     $ 61,679  
Schedule of Condensed Balance Sheet [Table Text Block] Summarized financial information for each of the Company’s equity method investees, as of their fiscal year end is presented in the following table (amounts in thousands):
As of December 31, 2012            
             
    Patriot     Big River  
                 
Current assets   $ 22,302     $ 139,879  
Non current assets     161,319       375,803  
Total assets   $ 183,621     $ 515,682  
Current liabilities   $ 20,201     $ 90,865  
Long-term liabilities     65,867       87,301  
Total liabilities   $ 86,068     $ 178,166  
Noncontrolling interests   $ —     $ 29,007  
                 
As of December 31, 2011                
    Patriot     Big River  
                 
Current assets   $ 24,972     $ 139,858  
Non current assets     168,518       406,522  
Total assets   $ 193,490     $ 546,380  
Current liabilities   $ 20,966     $ 72,798  
Long-term liabilities     76,103       111,928  
Total liabilities   $ 97,069     $ 184,726  
Noncontrolling interests   $ —     $ 33,224  
Schedule of Financial Information for Equity Method Investments [Table Text Block] The summarized information for NuGen is presented for the ten months ended October 31, 2011 and for the six months ended December 31, 2010 (amounts in thousands):
Year Ended December 31, 2012            
    Patriot     Big River  
Nugen
 
                       
Net sales and revenue   $ 365,302     $ 1,135,956    
—
 
Gross profit   $ 7,685     $ 20,651    
—
 
Income from continuing operations   $ 1,320     $ 2,799    
—
 
Net income   $ 1,320     $ 2,799    
—
 

Year Ended December 31, 2011 and Period from January 1, 2011 through October 31, 2011 (NuGen)

 
    Patriot     Big River     Nugen  
                         
Net sales and revenue   $ 377,250     $ 1,162,308     $ 256,973  
Gross profit   $ 29,207     $ 105,207     $ 24,490  
Income from continuing operations   $ 22,615     $ 71,384     $ 18,133  
Net income   $ 22,615     $ 71,384     $ 18,133  

Year Ended December 31, 2010 and Period from July 1, 2010 through December 31, 2010 (NuGen)

 
    Patriot     Big River     Nugen  
                         
Net sales and revenue   $ 261,117     $ 742,163     $ 121,871  
Gross profit   $ 26,936     $ 83,671     $ 12,977  
Income from continuing operations   $ 21,385     $ 52,478     $ 9,772  
Net income   $ 21,385     $ 52,478     $ 9,772