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Significant Accounting Policies - Mutual Fund Adminstration Revenue (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mutual fund administration:      
Administration revenue, gross $ 16,692,093 $ 13,074,707 $ 11,617,140
12b-1/service fees and commission revenue received from fund clients 8,481,442 6,868,974 7,058,471
12b-1/service fees and commission expense payments to third parties (7,404,361) (5,597,757) (5,577,925)
Fund related expense (6,321,374) (5,469,023) (5,254,733)
Revenue, net of fund related expenses 11,447,800 8,876,901 7,842,953
DHCM C-Share financing:      
Broker commission advance repayments 365,380 217,227 352,740
Broker commission amortization (347,853) (219,951) (317,137)
Financing activity, net 17,527 (2,724) 35,603
Mutual fund administration revenue, net $ 11,465,327 $ 8,874,177 $ 7,878,556