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Investment in Magnolia Fund (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2010 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net investment income (loss) |  | $ 163,000 | $ 658,000 | $ 59,000
Return on investment in Magnolia |  | 3,814,000 | 1,179,000 | 4,735,000
Magnolia TC 2, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to obtain interest in equity method investment | 12,150,000 |  |  |
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 (loss) |  | 163,000 | 658,000 | 59,000
Return on investment in Magnolia |  | $ 3,814,000 | $ 1,179,000 | $ 4,735,000

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