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Investment Portfolio Equity Method Investments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]      
Total assets $ 144,118,745 $ 189,819,824  
Total liabilities 38,009,765 45,931,979  
Net assets 106,108,980 143,887,845  
DHCM's portion of net assets 36,043,704 41,338,046  
Investment income 2,944,836 3,272,972 $ 792,691
Expenses 1,176,896 1,409,896 5,506
Net realized gains 4,432,850 1,981,185 1,219,565
Net change in unrealized appreciation (depreciation) 5,613,627 10,458,073 (1,879,047)
Net income 11,814,417 14,302,334 127,703
DHCM's portion of net income $ 3,206,702 $ 4,392,636 $ 124,825