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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 7,939,450 $ 7,360,624
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation on furniture and equipment 162,177 166,371
Stock-based compensation 2,155,813 2,127,217
(Increase) decrease in accounts receivable 425,914 (1,107,002)
Change in deferred income taxes (246,121) (442,141)
Investment gain/loss, net (789,799) (447,151)
Increase (decrease) in accrued liabilities (3,471,314) (130,587)
Other changes in assets and liabilities (379,716) (826,332)
Net cash provided by (used in) operating activities 5,796,404 6,700,999
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of furniture and equipment (55,867) (85,571)
Cost of investments purchased and other portfolio activity (6,365,000) (926,998)
Proceeds from sale of investments   2,333,000
Net cash provided by (used in) investing activities (6,420,867) 1,320,431
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of taxes withheld on employee stock transactions (363,925) (139,707)
Proceeds from common stock issuance 517,721 479,442
Net cash provided by (used in) financing activities 153,796 339,735
CASH AND CASH EQUIVALENTS    
Net change during the period (470,667) 8,361,165
At beginning of period 15,242,768 5,775,526
At end of period 14,772,101 14,136,691
Supplemental cash flow information:    
Interest paid      
Income taxes paid 5,418,000 5,733,000
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 5,540,792 $ 7,461,984