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Segment Reporting (Tables)
 3 Months Ended
Apr. 30, 2013
Schedule of Segment Reporting Information Profit Loss And Revenue Percentage [Table Text Block] Amounts below include corporate activities that are not separately reportable and income from synthetic fuel investments (amounts in thousands):
    Three Months Ended
April 30, 		 
    2013     2012  
Net sales and revenue:                
Alternative energy   $ 178,324     $ 150,664  
Real estate     423       342  
Total net sales and revenue   $ 178,747     $ 151,006  
                 
Segment gross profit:                
Alternative energy   $ 9,026     $ 5,510  
Real estate     71       15  
Total gross profit   $ 9,097     $ 5,525  
    Three Months Ended
April 30, 		 
    2013     2012  
Segment profit (loss):                
Alternative energy   $ 6,626     $ 2,469  
Real estate     8       (60 )
Corporate expense     (701 )     (548 )
Interest expense     (14 )     (18 )
Interest income     18       29  
Income from continuing operations before income taxes   $ 5,937     $ 1,872  
    Three Months Ended
April 30, 		 
    2013     2012  
Sales of products alternative energy segment:            
Ethanol     74 %     78 %
Dried distillers grains     17 %     17 %
Modified distillers grains     6 %     3 %
Other     3 %     2 %
Total     100 %     100 %
                 
Sales of services real estate segment:                
Lease revenue     100 %     100 %
Schedule of Segment Reporting Information Assets [Table Text Block] The following table summarizes segment assets (amounts in thousands):
      April 30,
2013 		      January 31,
2013 		 
Assets:                
Alternative energy   $ 341,863     $ 337,857  
Real estate     12,271       13,326  
Corporate     52,436       54,147  
Total assets   $ 406,570     $ 405,330