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SEGMENT REPORTING (Tables) | 12 Months Ended
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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 |

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