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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 18,690,744 $ 12,677,633
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 279,024 146,232
Stock-based compensation 4,074,437 3,608,289
Increase in accounts receivable (1,505,693) (1,478,276)
Change in current income taxes (1,566,748) (6,943,752)
Change in deferred income taxes (795,408) 2,431,661
Net investment gain (1,786,994) (2,057,435)
Decrease in accrued incentive compensation (3,411,792) (2,736,793)
Increase in deferred compensation 4,532,517 4,106,669
Excess income tax benefit from stock-based compensation (1,619,727) (226,873)
Other changes in assets and liabilities 227,075 130,017
Net cash provided by operating activities 17,117,435 9,657,372
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (722,352) (80,033)
Cost of investments purchased and other portfolio activity (11,040,594) (15,308,201)
Proceeds from sale of investments 3,492,995 0
Net cash used in investing activities (8,269,951) (15,388,234)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Value of shares withheld related to employee tax withholding (3,235,604) (365,420)
Excess income tax benefit from stock-based compensation 1,619,727 226,873
Net cash used in financing activities (1,615,877) (138,547)
CASH AND CASH EQUIVALENTS    
Net change during the period 7,231,607 (5,869,409)
At beginning of period 35,777,140 33,106,972
At end of period 43,008,747 27,237,563
Supplemental cash flow information:    
Income taxes paid 12,789,528 12,089,759
Supplemental disclosure of non-cash transactions:    
Common stock issued as incentive compensation $ 3,826,458 $ 3,984,817