Consolidated Statements of Cash Flows (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 9,512,622us-gaap_NetIncomeLoss	$ 5,749,598us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	106,462us-gaap_Depreciation	76,105us-gaap_Depreciation
Stock-based compensation	1,968,572us-gaap_ShareBasedCompensation	1,924,466us-gaap_ShareBasedCompensation
Increase in accounts receivable	(211,141)	(394,303)
Change in current income taxes	(511,672)	(8,725,576)
Change in deferred income taxes	(36,180)	2,436,709
Net investment gain	(1,337,887)us-gaap_GainLossOnInvestments	(549,449)us-gaap_GainLossOnInvestments
Decrease in accrued compensation	(9,765,792)	(9,753,793)
Increase in deferred compensation	4,408,762	3,918,507
Excess income tax benefit from stock-based compensation	(1,343,455)	(166,674)
Other changes in assets and liabilities	(664,981)	(844,856)
Net cash provided by (used in) operating activities	2,125,310	(6,329,266)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(565,144)	(56,556)
Cost of investments purchased and other portfolio activity	(4,292,263)us-gaap_PaymentsToAcquireInvestments	(15,308,201)us-gaap_PaymentsToAcquireInvestments
Net cash used in investing activities	(4,857,407)	(15,364,757)
CASH FLOWS FROM FINANCING ACTIVITIES:
Value of shares withheld related to employee tax withholding	(2,891,523)	(314,796)
Excess income tax benefit from stock-based compensation	1,343,455	166,674
Net cash used in financing activities	(1,548,068)	(148,122)
CASH AND CASH EQUIVALENTS
Net change during the period	(4,280,165)	(21,842,145)
At beginning of period	35,777,140	33,106,972
At end of period	31,496,975	11,264,827
Supplemental cash flow information:
Interest Paid	0us-gaap_InterestPaid	0us-gaap_InterestPaid
Income taxes paid	5,519,528us-gaap_IncomeTaxesPaid	9,700,831us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash transactions:
Common stock issued as compensation	$ 3,826,458	$ 3,984,817

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