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Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Schedule of Investments [Line Items]      
Accounts Receivable, Related Parties $ 9,200,000 $ 7,900,000  
Number of business segment | Segment 1    
Allowance for doubtful accounts $ 0 0  
Fair Value, Transfers Between Level 1, Level 2, or Level 3, Amount $ 0 0  
Rolling Client Investment Performance Period 5 years    
Advance Commissions Amortization Period 12 months    
Contractual Expense Reimbursement $ 2,291,910 1,849,786 $ 375,825
Liability for Uncertain Tax Positions, Current 0 0  
Money Market Funds | Mutual Funds | Level 1 Inputs      
Schedule of Investments [Line Items]      
Cash equivalent fair value 51,200,000 31,800,000  
Incentive Fees Under Method One      
Schedule of Investments [Line Items]      
Performance Fees 0 0 0
Investment Advisory Services [Member]      
Schedule of Investments [Line Items]      
Revenue from Related Parties 80,700,000 65,100,000 48,500,000
Mutual fund administrative services [Member]      
Schedule of Investments [Line Items]      
Revenue from Related Parties $ 14,300,000 $ 13,100,000 $ 9,700,000