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Long Term Debt and Interest Rate Swaps (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  |  |  |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |  | 6 Months Ended
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Jul. 31, 2013 | Jan. 31, 2013 | Jul. 31, 2013 Interest Rate Swap One [Member] One Earth Energy [Member] | Jul. 31, 2009 Interest Rate Swap One [Member] One Earth Energy [Member] | Jul. 31, 2013 Interest Rate Swap [Member] One Earth Energy [Member] | Jan. 31, 2013 Interest Rate Swap [Member] One Earth Energy [Member] | Jul. 31, 2013 Interest Rate Swap [Member] | Jan. 31, 2008 One Earth Energy [Member] Construction Loans [Member] | Jul. 31, 2013 One Earth Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2008 One Earth Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2008 One Earth Energy [Member] Letter of Credit [Member] | Jul. 31, 2013 One Earth Energy [Member] Term Loan [Member] | Jan. 31, 2013 One Earth Energy [Member] Term Loan [Member] | Oct. 31, 2009 One Earth Energy [Member] | Jul. 31, 2013 One Earth Energy [Member] | Jan. 31, 2008 One Earth Energy [Member] | Jul. 31, 2013 One Earth Energy [Member] Minimum [Member] Term Loan [Member] | Jul. 31, 2013 One Earth Energy [Member] Minimum [Member] | Jul. 31, 2013 One Earth Energy [Member] Maximum [Member] Term Loan [Member] | Jul. 31, 2013 One Earth Energy [Member] Maximum [Member] | Jul. 31, 2013 First National Bank [Member] | Jan. 31, 2012 Nu Gen Energy [Member] Revolving Credit Facility [Member] | Jul. 31, 2013 Nu Gen Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2012 Nu Gen Energy [Member] Term Loan [Member] | Jul. 31, 2013 Nu Gen Energy [Member] Term Loan [Member] | Jan. 31, 2013 Nu Gen Energy [Member] Term Loan [Member] | Jan. 31, 2012 Nu Gen Energy [Member] | Jul. 31, 2013 Nu Gen Energy [Member] | Jan. 31, 2014 Nu Gen Energy [Member] | Oct. 31, 2013 Nu Gen Energy [Member] | Apr. 30, 2013 Nu Gen Energy [Member] | Jul. 31, 2013 Nu Gen Energy [Member] Minimum [Member] | Jul. 31, 2013 Nu Gen Energy [Member] Maximum [Member]
Long Term Debt and Interest Rate Swaps (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Bank Debt |  |  |  |  |  |  |  | $ 100,000,000 |  | $ 10,000,000 | $ 1,000,000 |  |  |  |  | $ 111,000,000 |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 | $ 55,000,000 |  |  | $ 65,000,000 |  |  |  |  |  |
Debt Conversion, Original Debt, Type of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The construction loan was converted into a term loan on July 31, 2009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 280 basis points to LIBOR plus 300 basis points |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 325 basis points |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10% |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payment |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 quarterly payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 quarterly payments |  |  |  |  |
Long Term Debt Principal Portion Amortization Schedule |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 months |  |  |  |  |  |  |  |  |  |  | 120 months |  |  |  |  |  |  |  |
Debt Instrument Refinanced Amount | 44,101,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Refinanced Amount Interest Rate | LIBOR plus 300 basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Unscheduled Principal Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument prepaid principal payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Maturities First Repayments of Principal in Year Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Maturities Second Repayment of Principal in Year Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt Maturities Principal Payment Due Beginning Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 08, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt Maturities Principal Payment Due Ending Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 08, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Quarterly Principal Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt Maturities Quarterly Principal Payment Due Beginning Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 08, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt Maturities Quarterly Principal Payment Due Ending Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 08, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Principal Payments as Percentage of Annual Excess Cash Flows |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
Debt Instrument, Annual Principal Payment |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Debt Instrument Maximum Payment Aggregate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  | 52,600,000 |  |  |  |  |  |  |  |  |  |  |  |  | 45,400,000 |  |  |  |  |  |  |  |
Fixed Charge Coverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  | 1.10% |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.10%
Period Of Loan Agreement To Maintain Compliance With Covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |
Payments of Financing Costs |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 80,600,000 | 77,900,000 |  |  |  |  |  |  |  |  |  |  |  | 53,100,000 | 49,500,000 |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 500,000 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  | Jul. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  | May 31, 2014 |  | Oct. 31, 2016 |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount |  |  |  | 50,000,000 |  |  | 35,668,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swap Termination Date |  |  | July 8, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 7.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability | 1,933,000 | 2,789,000 |  |  | 1,900,000 | 2,800,000 | 1,933,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Libor Floor Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
Minimum Working Capital Regarding Modification Of The Covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 | $ 10,000,000 | $ 7,500,000 | $ 7,500,000 |  |

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