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Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 25,419,204 $ 19,028,213
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 453,702 216,680
Stock-based compensation 6,287,899 5,501,785
Increase in accounts receivable (474,491) (2,348,951)
Change in current income taxes (4,523,875) (7,506,205)
Change in deferred income taxes (896,137) 3,135,159
Net investment (gain)/loss 1,788,286 (956,824)
Increase in accrued incentive compensation 3,410,208 4,608,207
Increase in deferred compensation 3,835,923 4,016,878
Excess income tax benefit from stock-based compensation (1,950,951) (404,309)
Other changes in assets and liabilities 2,484,335 148,027
Net cash provided by operating activities 35,834,103 25,438,660
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (1,249,204) (677,273)
Cost of investments purchased and other portfolio activity (17,289,987) (15,308,201)
Proceeds from sale of investments 6,833,602 1,196
Net cash used in investing activities (11,705,589) (15,984,278)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Value of shares withheld related to employee tax withholding (3,758,265) (520,978)
Excess income tax benefit from stock-based compensation 1,950,951 404,309
Net cash used in financing activities (1,807,314) (116,669)
CASH AND CASH EQUIVALENTS    
Net change during the period 22,321,200 9,337,713
At beginning of period 35,777,140 33,106,972
At end of period 58,098,340 42,444,685
Supplemental cash flow information:    
Income taxes paid 19,747,806 15,575,725
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 3,826,458 $ 3,753,088