Consolidated Statements of Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES:
Investment advisory	$ 89,900,834	$ 69,966,377	$ 57,783,131
Mutual fund administration, net	14,657,931	11,465,327	8,874,177
Total revenue	104,558,765	81,431,704	66,657,308
OPERATING EXPENSES:
Compensation and related costs	43,892,336	40,851,722	33,868,225
General and administrative	8,099,410	6,042,781	4,986,559
Sales and marketing	2,222,382	2,098,915	1,817,124
Mutual fund administration	2,884,495	1,756,366	1,556,909
Total operating expenses	57,098,623	50,749,784	42,228,817
NET OPERATING INCOME	47,460,142	30,681,920	24,428,491
Investment income	2,905,794	4,950,245	1,654,124
INCOME BEFORE TAXES	50,365,936	35,632,165	26,082,615
Income tax provision	(18,785,005)	(13,477,337)	(9,151,723)
NET INCOME	$ 31,580,931	$ 22,154,828	$ 16,930,892
Earnings per share
Basic (per share)	$ 9.88	$ 7.05	$ 5.44
Diluted (per share)	$ 9.67	$ 6.94	$ 5.44
Weighted average shares outstanding
Basic (in shares)	3,196,127	3,142,083	3,111,328
Diluted (in shares)	3,266,168	3,194,263	3,111,328