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Investments - Equity Method Investments (Detail) - USD ($)	12 Months Ended
	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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The amount of expenses reported by an equity method investment of the entity.

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