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Investments - Equity Method Investments (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |  |  |
Total assets | $ 80,845,124 | $ 144,118,745 |
Total liabilities | 22,287,437 | 38,009,765 |
Net assets | 58,557,687 | 106,108,980 |
DHCM's portion of net assets | 16,339,649 | 36,043,704 |
Investment income | 1,154,007 | 2,944,836 | $ 3,272,972
Expenses | 978,322 | 1,176,896 | 1,409,896
Net realized gains | 1,918,661 | 4,432,850 | 1,981,185
Net change in unrealized appreciation (depreciation) | (10,229,319) | 5,613,627 | 10,458,073
Net income | (8,134,973) | 11,814,417 | 14,302,334
DHCM’s portion of net income | $ (2,400,467) | $ 3,206,702 | $ 4,392,636

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