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Variable Interest Entities (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jul. 31, 2012 Project	Jul. 31, 2012 Project
Variable Interest Entities (Textual) [Abstract]
Net losses associated with moxie project entities	$ 387,000	$ 214,000
Variable Interest Entity (Additional Textual) [Abstract]
Number of natural gas-fired power plant projects under development	2	2
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities (Textual) [Abstract]
Prospective amount of loan to Moxie projects	9,000,000	9,000,000
Prospective amount of loan to Moxie Projects, maximum amount	10,000,000	10,000,000
Maturity date for all current and future loans		Sep. 30, 2014
Initial and additional development loans Moxie Project	$ 3,100,000	$ 3,100,000

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- Definition

Current and future loans under prospective funding arrangement, expiration date.

+ References

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- Definition

Number of gas-fired power plant projects under development.

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- Definition

Prospective funding arrangement, current capacity.

+ References

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- Definition

Prospective funding arrangement, maximum capacity.

+ References

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522



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-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The amount of income (loss) from operations derived by the reporting entity during the period from the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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