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Consolidated Statements of Cash Flows (unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 5,330,733 $ 4,611,353
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation on furniture and equipment 80,199 85,265
Stock-based compensation 1,486,008 1,329,009
Increase in accounts receivable (1,080,720) (590,013)
Change in deferred income taxes 313,075 297,010
Investment gain/loss, net (1,889,425) (1,265,356)
Decrease in accrued compensation (6,376,220) (6,849,702)
Excess income tax benefit from stock-based compensation   (9,445)
Decrease in accounts payable and accrued expenses (573,440) (600,729)
Other changes in assets and liabilities 544,119 230,148
Net cash used in operating activities (2,165,671) (2,762,460)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of furniture and equipment (305,257) (37,040)
Cost of investments purchased and other portfolio activity   (2,365,000)
Net cash used in investing activities (305,257) (2,402,040)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of taxes withheld on employee stock transactions    (363,925)
Excess income tax benefit from stock-based compensation    9,445
Net cash used in financing activities 0 (354,480)
CASH AND CASH EQUIVALENTS    
Net change during the period (2,470,928) (5,518,980)
At beginning of period 7,870,908 15,242,768
At end of period 5,399,980 9,723,788
Supplemental cash flow information:    
Interest paid      
Income taxes paid 2,130,000 2,163,000
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 4,606,008 $ 5,540,792