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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 19,028,213 $ 15,404,014
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation on furniture and equipment 216,680 235,216
Stock-based compensation 5,501,785 4,554,322
Increase in accounts receivable (2,348,951) (900,795)
Change in current income taxes (7,506,205) 1,482,381
Change in deferred income taxes 3,135,159 (810,553)
Net investment gain (956,824) (3,579,485)
Increase in accrued compensation 8,625,085 4,819,401
Excess income tax benefit from stock-based compensation (404,309) (85,646)
Other changes in assets and liabilities 148,027 376,747
Net cash provided by operating activities 25,438,660 21,495,602
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of furniture and equipment (677,273) (403,873)
Cost of investments purchased and other portfolio activity (15,308,201) (2,000,000)
Proceeds from sale of investments 1,196 0
Net cash used in investing activities (15,984,278) (2,403,873)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Value of shares withheld related to employee tax withholding (520,978) (652,165)
Excess income tax benefit from stock-based compensation 404,309 85,646
Net cash used in financing activities (116,669) (566,519)
CASH AND CASH EQUIVALENTS    
Net change during the period 9,337,713 18,525,210
At beginning of period 33,106,972 7,870,908
At end of period 42,444,685 26,396,118
Supplemental cash flow information:    
Income taxes paid 15,575,725 8,640,000
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 3,753,088 $ 4,606,008