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Long Term Debt and Interest Rate Swaps (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  |  |  | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 3 Months Ended | 1 Months Ended | 3 Months Ended |
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Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2014 | Jul. 31, 2013 | Jan. 31, 2014 | Jul. 31, 2014 Interest Rate Swap One [Member] One Earth Energy [Member] | Jan. 31, 2014 Interest Rate Swap One [Member] One Earth Energy [Member] | Jul. 31, 2009 Interest Rate Swap One [Member] One Earth Energy [Member] | Jul. 31, 2014 Term Loan [Member] Minimum [Member] One Earth Energy [Member] | Jul. 31, 2014 Term Loan [Member] Maximum [Member] One Earth Energy [Member] | Jul. 31, 2014 Term Loan [Member] One Earth Energy [Member] | Jan. 31, 2014 Term Loan [Member] One Earth Energy [Member] | Nov. 30, 2011 Term Loan [Member] Nu Gen Energy [Member] | Apr. 30, 2014 Term Loan [Member] Nu Gen Energy [Member] | Jul. 31, 2014 Term Loan [Member] Nu Gen Energy [Member] | Jan. 31, 2014 Term Loan [Member] Nu Gen Energy [Member] | Jul. 31, 2014 Revolving Credit Facility [Member] One Earth Energy [Member] | Jan. 31, 2014 Revolving Credit Facility [Member] One Earth Energy [Member] | Nov. 30, 2011 Revolving Credit Facility [Member] Nu Gen Energy [Member] | Jan. 31, 2014 Revolving Credit Facility [Member] Nu Gen Energy [Member] | Apr. 30, 2014 Revolving Credit Facility [Member] Nu Gen Energy [Member] | Jul. 31, 2014 Maximum [Member] Nu Gen Energy [Member] | Jul. 31, 2014 One Earth Energy [Member] | Nov. 30, 2011 Nu Gen Energy [Member] | Jul. 31, 2014 Nu Gen Energy [Member] | Jan. 31, 2014 Nu Gen Energy [Member]
Long Term Debt and Interest Rate Swaps (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Refinanced Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,101,000 |  |  |
Debt Instrument Refinanced Amount Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 300 basis points |  | LIBOR plus 300 basis points |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  | 3.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, quarterly principle payments |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Maturities Quarterly Principal Payment Due Beginning Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 08, 2014 |  |  |
Debt Instrument Maximum Payment Aggregate |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Excess Cash Flow Principle Payments, Maximum |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Annual Principal Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  | 6,000,000 |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | 32,000,000 | 39,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 31, 2015 |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 265 basis points |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 | 0 |  |  |  |  |
Payments of Financing Costs |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  | 100,700,000 | 86,900,000 |  |  |  |  |  |  |  |  |  |  |  |  | 96,300,000 | 66,100,000
Derivative Liability, Notional Amount |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 7.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability | 371,000 |  | 371,000 |  | 1,141,000 | 400,000 | 1,100,000 |  |  |  |  |  |  |  | 30,000,000 | 36,600,000 |  |  |  |  |  |  |  |  |  |
Derivative Settlement on Interest Rate Swap | 376,000 | 422,000 | 774,000 | 862,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (1,000) | (10,000) | (5,000) | (6,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |  |
Proceeds from Bank Debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,000,000 |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  | $ 65,000,000 |  |
Debt Instrument, Frequency of Periodic Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 quarterly payments |
Debt Instrument Principal Payments As Percentage Of Annual Excess Cash Flows |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 275 basis points |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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