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Investment in Magnolia Fund (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2010 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net investment income |  | $ 59 | $ 68 | $ 549
Company's share of distributions |  | 4,735 | 2,484 |
Magnolia TC 2, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to obtain interest in equity method investment | 12,150 |  |  |
Percent of equity interest | 39.00% | 39.00% |  |
Minimum percent of face amount of the certificate required to be paid to obtain a tax certificate |  | 5.00% |  |
Percentage of earnings recognized on tax certificate portfolio |  | 5.00% |  |
Expenses, acquisition fee percentage |  | 1.00% |  |
Net investment income |  | 59 | 68 | 549
Company's share of distributions |  | $ 4,735 | $ 2,485 |

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