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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net Income $ 22,154,828 $ 16,930,892 $ 14,352,968
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation on furniture and equipment 306,005 305,897 330,971
Stock-based compensation 7,319,401 5,750,981 4,933,613
Increase in accounts receivable (2,563,697) (142,875) (1,600,620)
Change in current income taxes 8,520,834 (105,166) (976,574)
Change in deferred income taxes (5,616,211) (368,572) (1,221,328)
Net investment (gain) loss (4,270,928) (1,135,598) 111,078
Increase in accrued compensation 8,797,907 5,469,062 8,125,191
Excess income tax benefit from stock-based compensation (425,380) (34,543) (7,007)
Income tax benefit from dividends paid on unvested shares (357,188) (1,992,298) 0
Other changes in assets and liabilities 715,570 (131,087) (1,339,002)
Net cash provided by operating activities 34,581,141 24,546,693 22,709,290
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of furniture and equipment (525,472) (221,592) (253,082)
Cost of investments purchased and other portfolio activity (2,306,947) (7,463,796) (925,507)
Proceeds from sale of investments 4,355,536 304,152 4,133,000
Net cash provided by (used in) investing activities 1,523,117 (7,381,236) 2,954,411
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payment for repurchase of common shares 0 0 (1,072,908)
Shares withheld related to employee tax withholding (1,884,187) (1,348,262) (158,988)
Excess income tax benefit from stock-based compensation 425,380 34,543 7,007
Income tax benefit from dividends paid on unvested shares 357,188 1,992,298 0
Payment of dividends (9,766,575) (25,215,896) (14,971,570)
Net cash used in financing activities (10,868,194) (24,537,317) (16,196,459)
CASH AND CASH EQUIVALENTS      
Net change during the year 25,236,064 (7,371,860) 9,467,242
At beginning of year 7,870,908 15,242,768 5,775,526
At end of year 33,106,972 7,870,908 15,242,768
Supplemental cash flow information:      
Interest paid 0 0 0
Income taxes paid 10,575,000 9,636,000 10,849,000
Supplemental disclosure of non-cash transactions:      
Common stock issued as incentive compensation $ 4,606,008 $ 5,540,792 $ 7,461,984