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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 15,404,014 $ 12,106,236
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation on furniture and equipment 235,216 235,118
Stock-based compensation 4,554,322 4,207,079
Increase in accounts receivable (900,795) (466,346)
Change in deferred income taxes (810,553) (600,358)
Net investment (gain) loss (3,579,485) (1,400,902)
Increase in accrued compensation 4,819,401 1,159,897
Excess income tax benefit from stock-based compensation (85,646) (29,029)
Increase (decrease) in accrued liabilities 741,040 (35,385)
Other changes in assets and liabilities 1,118,088 (44,201)
Net cash provided by operating activities 21,495,602 15,132,109
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of furniture and equipment (403,873) (189,823)
Cost of investments purchased and other portfolio activity (2,000,000) (6,365,000)
Proceeds from sale of investments   304,152
Net cash used in investing activities (2,403,873) (6,250,671)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of taxes withheld on employee stock transactions (652,165) (382,104)
Excess income tax benefit from stock-based compensation 85,646 29,029
Net cash used in financing activities (566,519) (353,075)
CASH AND CASH EQUIVALENTS    
Net change during the period 18,525,210 8,528,363
At beginning of period 7,870,908 15,242,768
At end of period 26,396,118 23,771,131
Supplemental cash flow information:    
Interest paid      
Income taxes paid 8,640,000 7,741,000
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 4,606,008 $ 5,540,792