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Investment Portfolio - Summary of Partnership Investments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Nonconsolidated, Total Assets | $ 104,763,018 | $ 113,050,560 | $ 118,989,180
Variable Interest Entity, Nonconsolidated, Total Liabilities | 24,622,223 | 21,779,556 | 25,217,600
Variable Interest Entity, Nonconsolidated, Total Assets and Liabilities, Net | 80,140,795 | 91,271,004 | 93,771,580
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | 0 | 0 | 1,133
Variable Interest Entity, Nonconsolidated, Operating Income or Loss | (9,145,162) | 8,346,265 | 23,358,257
Variable Interest Entity, Measure of Activity, Operating Income or Loss | 0 | 0 | 1,798
Equity Method Investee [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity Method Investment, Summarized Financial Information, Assets | 11,653,249 | 15,131,651 | 3,117,223
Equity Method Investment, Summarized Financial Information, Liabilities | 25,996 | 3,015 | 0
Equity Method Investment Summarized Financial Information, Equity | 11,627,253 | 15,128,636 | 3,117,223
Equity Method Investments | 11,274,109 | 14,652,589 | 3,000,328
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 127,703 | 524,153 | 936,238
Income (Loss) from Equity Method Investments | $ 124,825 | $ 491,951 | $ 898,160

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