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Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 10,042,277 $ 7,939,450
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation on furniture and equipment 165,533 162,177
Stock-based compensation 3,006,652 2,673,534
(Increase) decrease in accounts receivable (1,191,096) 425,914
Change in deferred income taxes (1,366,935) (246,121)
Investment (gain)/loss, net (2,644,562) (789,799)
Decrease in accrued compensation (853,327) (2,865,625)
Excess income tax benefit from stock-based compensation   (29,029)
Decrease in accrued liabilities (431,732) (605,689)
Other changes in assets and liabilities 642,920 (379,716)
Net cash provided by operating activities 7,369,730 6,285,096
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of furniture and equipment (334,429) (55,867)
Cost of investments purchased and other portfolio activity (2,000,000) (6,365,000)
Net cash used in investing activities (2,334,429) (6,420,867)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of taxes withheld on employee stock transactions (56,732) (363,925)
Excess income tax benefit from stock-based compensation   29,029
Net cash used in financing activities (56,732) (334,896)
CASH AND CASH EQUIVALENTS    
Net change during the period 4,978,569 (470,667)
At beginning of period 7,870,908 15,242,768
At end of period 12,849,477 14,772,101
Supplemental cash flow information:    
Interest paid      
Income taxes paid 7,030,000 5,418,000
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 4,606,008 $ 5,540,792