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Significant Accounting Policies - Mutual Fund Adminstration Revenue (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mutual fund administration:      
Administration revenue, gross $ 26,219,881 $ 26,664,635 $ 27,042,861
12b-1/service fees and commission revenue received from fund clients 0 6,360,400 11,087,978
12b-1/service fees and commission expense payments to third parties 0 (5,660,430) (9,617,568)
Fund related expense (13,748,445) (12,937,067) (12,031,353)
Revenue, net of fund related expenses 12,471,436 14,427,538 16,481,918
DHCM C-Share financing:      
Broker commission advance repayments 416,614 691,228 991,430
Broker commission amortization (374,783) (660,840) (962,919)
Financing activity, net 41,831 30,388 28,511
Mutual fund administration revenue, net $ 12,513,267 $ 14,457,926 $ 16,510,429