Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
REVENUES:
Investment advisory	$ 121,645,149	$ 107,915,557	$ 89,900,834
Mutual fund administration, net	14,457,926	16,510,429	14,657,931
Total revenue	136,103,075	124,425,986	104,558,765
OPERATING EXPENSES:
Compensation and related costs	52,264,843	47,951,039	43,892,336
General and administrative	12,621,831	10,245,866	8,099,410
Sales and marketing	4,263,143	4,179,064	2,222,382
Mutual fund administration	3,884,655	3,330,265	2,884,495
Total operating expenses	73,034,472	65,706,234	57,098,623
NET OPERATING INCOME	63,068,603	58,719,752	47,460,142
Investment income (loss)	7,517,398	(736,590)	2,905,794
Gain on sale of subsidiary	2,675,766	0	0
INCOME BEFORE TAXES	73,261,767	57,983,162	50,365,936
Income tax expense	(26,667,635)	(20,908,665)	(18,785,005)
NET INCOME	46,594,132	37,074,497	31,580,931
Less: Net income attributable to redeemable noncontrolling interest	(542,209)	0	0
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 46,051,923	$ 37,074,497	$ 31,580,931
Earnings per share attributable to common shareholders
Basic (per share)	$ 13.52	$ 11.31	$ 9.88
Diluted (per share)	$ 13.49	$ 11.03	$ 9.67
Weighted average shares outstanding
Basic (in shares)	3,407,408	3,277,920	3,196,127
Diluted (in shares)	3,413,391	3,359,786	3,266,168