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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, 2013 
         | 
        
           Sep. 30, 2012 
         | 
        
           Sep. 30, 2011 
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| Schedule of Equity Method Investments [Line Items] | ||||
| Net investment income (loss) | $ 658 | $ 59 | $ 68 | |
| Return on investment in Magnolia | 1,179 | 4,735 | 2,484 | |
| 
           Magnolia TC 2, LLC [Member] 
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| 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 (loss) | 658 | 59 | 68 | |
| Return on investment in Magnolia | $ 1,179 | $ 4,735 | $ 2,485 | |
| X | ||||||||||
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- Definition 
          Acquisition Fee Percentage. No definition available. 
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- Definition 
          Percent Of Certificate Face Amount Required To Obtain Tax Certificate. No definition available. 
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- Definition 
          Percent Of Minimum Earnings Recognized. No definition available. 
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- Definition 
          The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities. No definition available. 
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- Details 
          
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