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Special Purpose Entities (Details) (Textual) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 Project | Jul. 31, 2012 | Apr. 30, 2013 Moxie Liberty LLC [Member] | Jul. 31, 2013 Moxie Liberty LLC [Member] | Jul. 31, 2013 Moxie Patriot Llc [Member] | Jul. 31, 2013 Notes receivable [Member] Moxie Liberty LLC [Member] | Jul. 31, 2013 Accrued Interest Receivable on Notes [Member] Moxie Liberty LLC [Member] | Jul. 31, 2013 Loans Receivable [Member] | Jul. 31, 2013 Secured Debt [Member] | Jul. 31, 2012 Variable interest entity, primary beneficiary [Member] | Jul. 31, 2013 Variable interest entity, primary beneficiary [Member] | Jul. 31, 2012 Variable interest entity, primary beneficiary [Member] | Jul. 31, 2013 Joint Venture [Member] | Jul. 31, 2013 Joint Venture [Member]
Special Purpose Entities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses associated with moxie project entities | $ (1,300,000) | $ 220,000 | $ (1,830,000) | $ 396,000 |  |  |  |  |  |  |  | $ 362,000 | $ 261,000 | $ 644,000 |  |
Prospective amount of loan to Moxie Projects, maximum |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  | 20.00% | 10.00% |  |  |  |  |
Note Receivable from Moxie Liberty |  |  |  |  |  |  |  | 8,179,000 | 1,512,000 |  |  |  |  |  |  |
Company's amount of maximum exposure to loss |  |  |  |  |  | 9,691,000 |  |  |  |  |  |  |  |  |  |
Percentage of Interest Acquired In Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |
Percentage of revenue from consolidated joint venture as to Consolidated net revenue Description | Less Than 10% |  | Less Than 10% |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operating activities |  |  | (22,225,000) | 30,310,000 |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 57,864,000 | 82,619,000 | 104,512,000 | 146,309,000 |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in discontinued operating activities |  |  |  | (78,000) |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,000 | 79,000
Gains on the deconsolidation of variable interest entities | 1,324,000 |  | 2,444,000 |  | 1,120,000 |  | 1,324,000 |  |  |  |  |  |  |  |  |
Special Purpose Entities (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of natural gas-fired power plant projects under development |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Prospective amount of loan to Moxie projects |  |  | $ 8,179,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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