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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net Income $ 37,074,497 $ 31,580,931 $ 22,154,828
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 625,788 301,936 306,005
Stock-based compensation 8,551,734 7,303,799 7,319,401
Increase in accounts receivable (2,065,156) (3,511,851) (2,563,697)
Change in current income taxes 316,910 (3,324,298) 8,520,834
Change in deferred income taxes (3,547,087) 2,404,433 (5,616,211)
Net unrealized losses (gains) on investments 1,860,360 (1,517,662) (4,270,928)
Increase in accrued incentive compensation 5,829,708 4,127,457 8,304,806
Increase in deferred compensation 4,557,979 4,391,019 493,101
Excess income tax benefit from stock-based compensation (2,521,273) (666,889) (425,380)
Income tax benefit from dividends paid on unvested shares (376,394) (296,755) (357,188)
Other changes in assets and liabilities 1,724,253 1,827,723 715,570
Net cash provided by operating activities 52,031,319 42,619,843 34,581,141
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property and equipment (1,550,857) (1,504,368) (525,472)
Cost of investments purchased and other portfolio activity (22,095,491) (25,433,201) (2,306,947)
Proceeds from sale of investments 11,770,565 249,477 4,355,536
Net cash provided by (used in) investing activities (11,875,783) (26,688,092) 1,523,117
CASH FLOWS FROM FINANCING ACTIVITIES:      
Value of shares withheld related to employee tax withholding (4,323,676) (976,343) (1,884,187)
Excess income tax benefit from stock-based compensation 2,521,273 666,889 425,380
Income tax benefit from dividends paid on unvested shares 376,394 296,755 357,188
Payment of dividends (17,031,890) (13,248,884) (9,766,575)
Net cash used in financing activities (18,457,899) (13,261,583) (10,868,194)
CASH AND CASH EQUIVALENTS      
Net change during the year 21,697,637 2,670,168 25,236,064
At beginning of year 35,777,140 33,106,972 7,870,908
At end of year 57,474,777 35,777,140 33,106,972
Supplemental cash flow information:      
Income taxes paid 24,138,841 19,704,817 10,575,000
Supplemental disclosure of non-cash transactions:      
Common stock issued as incentive compensation 3,826,458 3,984,816 4,606,008
Charitable donation of corporate investments $ 1,401,202 $ 0 $ 0