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Significant Accounting Policies - Revenues From Contracts with Customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 31,175,755	$ 34,592,372	$ 91,350,429	$ 100,716,763
Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	29,362,652	32,498,101	86,219,325	94,521,491
Mutual fund administration revenue, net
Disaggregation of Revenue [Line Items]
Revenue	1,813,103	2,094,271	5,131,104	6,195,272
Proprietary funds
Disaggregation of Revenue [Line Items]
Revenue	23,248,861	26,272,711	69,744,167	78,288,958
Proprietary funds | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	21,435,758	24,178,440	64,613,063	72,093,686
Proprietary funds | Mutual fund administration revenue, net
Disaggregation of Revenue [Line Items]
Revenue	1,813,103	2,094,271	5,131,104	6,195,272
Sub-advised funds and separately managed accounts
Disaggregation of Revenue [Line Items]
Revenue	7,926,894	8,319,661	21,606,262	22,427,805
Sub-advised funds and separately managed accounts | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	7,926,894	8,319,661	21,606,262	22,427,805
Sub-advised funds and separately managed accounts | Mutual fund administration revenue, net
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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