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Significant Accounting Policies - Mutual Fund Adminstration Revenue (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mutual fund administration:      
Administration revenue, gross $ 27,042,861 $ 22,968,369 $ 16,692,093
12b-1/service fees and commission revenue received from fund clients 11,087,978 10,514,242 8,481,442
12b-1/service fees and commission expense payments to third parties (9,617,568) (9,102,565) (7,404,361)
Fund related expense (12,031,353) (9,753,359) (6,321,374)
Revenue, net of fund related expenses 16,481,918 14,626,687 11,447,800
DHCM C-Share financing:      
Broker commission advance repayments 991,430 878,105 365,380
Broker commission amortization (962,919) (846,861) (347,853)
Financing activity, net 28,511 31,244 17,527
Mutual fund administration revenue, net $ 16,510,429 $ 14,657,931 $ 11,465,327