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SEGMENT REPORTING (Tables)
 12 Months Ended
Jan. 31, 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):
    Years Ended January 31,  
    2013     2012     2011  
Net sales and revenues:                        
Alternative energy   $ 656,167     $ 408,635     $ 234,545  
Real estate     1,570       1,288       1,000  
Total net sales and revenues   $ 657,737     $ 409,923     $ 235,545  
                         
Segment gross profit (loss):                        
Alternative energy   $ 13,830     $ 35,179     $ 33,842  
Real estate     (294 )     (1,177 )     (287 )
Total gross profit   $ 13,536     $ 34,002     $ 33,555  
                         
Segment profit (loss):                        
                         
Alternative energy segment (loss) profit   $ (1,027 )   $ 48,580     $ 37,682  
Real estate segment loss     (511 )     (1,376 )     (467 )
Corporate expenses     (2,340 )     (2,307 )     (2,724 )
Interest expense     (65 )     (86 )     (175 )
Interest income     87       320       329  
Income from synthetic fuel investments     —       2,883       —  
(Loss) income from continuing operations  before income taxes   $ (3,856 )   $ 48,014     $ 34,645  
                         
Sales of products alternative energy segment:                        
Ethanol     76 %     82 %     83 %
Dried distillers grains     18 %     17 %     17 %
Modified distillers grains     4 %     1 %     — %
Other     2 %     — %     — %
Total     100 %     100 %     100 %
                         
Sales of services real estate segment:                        
Leasing     100 %     100 %     100 %
                         
Interest income:                        
Alternative energy   $ 37     $ 48     $ 68  
Real estate     42       48       39  
Unallocated     87       320       329  
                         
Total interest income   $ 166     $ 416     $ 436  
    Years Ended January 31,  
    2013     2012     2011  
Depreciation and amortization expense:                        
Alternative energy   $ 16,073     $ 11,653     $ 11,315  
Real estate     487       351       261  
Unallocated     —       —       182  
Total depreciation and amortization expense   $ 16,560     $ 12,004     $ 11,758  
                         
Equity in income of unconsolidated affiliates:                        
Alternative energy   $ 627     $ 21,532     $ 14,558  
Real estate     —       —       —  
Total equity in income of unconsolidated affiliates   $ 627     $ 21,532     $ 14,558  
                         
Schedule of Segment Reporting Information Assets [Table Text Block] The following table summarizes segment assets (amounts in thousands):
    Years Ended January 31,  
    2013     2012     2011  
Additions to property and equipment:                        
Alternative energy   $ 2,802     $ 7,276     $ 5,677  
Real estate     —       66       356  
Total additions to property and equipment   $ 2,802     $ 7,342     $ 6,033  
                         
Assets:                        
Alternative energy   $ 337,857     $ 367,029     $ 257,202  
Real estate     13,326       17,458       22,235  
Corporate and other     54,147       53,562       96,285  
Total assets   $ 405,330     $ 438,049     $ 375,722  
                         
Additions to other long lived assets:                        
Alternative energy   $ 645     $ 2,624     $ 10,112  
Real estate     —       —       —  
Total additions to other long lived assets   $ 645     $ 2,624     $ 10,112  
                         
Long term debt:                        
Alternative energy   $ 90,873     $ 107,706     $ 69,049  
Corporate and other     433       821       1,924  
Total long term debt   $ 91,306     $ 108,527     $ 70,973