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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 12,106,236 $ 9,899,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation on furniture and equipment 235,118 247,993
Stock-based compensation 3,416,920 3,086,851
(Increase) decrease in accounts receivable (466,346) 86,169
Change in deferred income taxes (600,358) (1,203,598)
Investment gain/loss, net (1,400,902) 866,697
Increase in accrued liabilities 1,124,512 4,730,270
Other changes in assets and liabilities (44,201) (1,253,727)
Net cash provided by operating activities 14,370,979 16,460,506
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of furniture and equipment (189,823) (227,774)
Cost of investments purchased and other portfolio activity (6,365,000) (925,507)
Proceeds from sale of investments 304,152 2,333,000
Net cash provided by (used in) investing activities (6,250,671) 1,179,719
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment for repurchase of common shares    (1,072,908)
Payment of taxes withheld on employee stock transactions (382,104) (141,442)
Proceeds from common stock issuance 790,159 718,966
Net cash provided by (used in) financing activities 408,055 (495,384)
CASH AND CASH EQUIVALENTS    
Net change during the period 8,528,363 17,144,841
At beginning of period 15,242,768 5,775,526
At end of period 23,771,131 22,920,367
Supplemental cash flow information:    
Interest paid      
Income taxes paid 7,741,000 8,343,676
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 5,540,792 $ 7,461,984