Interest rate stated in the contractual debt agreement.

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)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	num:percentItemType
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Commitments and Contingencies MBS Bonds (Details) (USD $)	Feb. 28, 2013	Dec. 31, 2011	Dec. 31, 2012 Trust Portfolio--MBS Bonds [Member]	Dec. 31, 2012 LIFERS [Member] Trust Portfolio--MBS Bonds [Member]	Dec. 31, 2012 SPEARS [Member] Trust Portfolio--MBS Bonds [Member]
Available for Sale Securities, not Including Premiums			$ 31,620,000
Debt Instrument, Interest Rate, Stated Percentage	9.00%
TOB Financing		$ 17,700,000		$ 6,500,000	$ 25,100,000