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Significant Accounting Policies - Mutual Fund Adminstration Revenue (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mutual fund administration:      
Administration revenue, gross $ 26,664,635 $ 27,042,861 $ 22,968,369
12b-1/service fees and commission revenue received from fund clients 6,360,400 11,087,978 10,514,242
12b-1/service fees and commission expense payments to third parties (5,660,430) (9,617,568) (9,102,565)
Fund related expense (12,937,067) (12,031,353) (9,753,359)
Revenue, net of fund related expenses 14,427,538 16,481,918 14,626,687
DHCM C-Share financing:      
Broker commission advance repayments 691,228 991,430 878,105
Broker commission amortization (660,840) (962,919) (846,861)
Financing activity, net 30,388 28,511 31,244
Mutual fund administration revenue, net $ 14,457,926 $ 16,510,429 $ 14,657,931