CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 5,610us-gaap_NetIncomeLoss	$ 5,562us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	145us-gaap_Depreciation	144us-gaap_Depreciation
Amortization of intangible assets	90us-gaap_AmortizationOfIntangibleAssets	90us-gaap_AmortizationOfIntangibleAssets
Unrealized gains on trading investments	(119)	(57)
Stock based compensation expense	3,678us-gaap_ShareBasedCompensation	3,479us-gaap_ShareBasedCompensation
Deferred income taxes	(570)us-gaap_DeferredIncomeTaxExpenseBenefit	3,924us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock based compensation	(1,392)	(1,893)
Net sales of investments - trading securities	15,700	19,206
Change in operating assets and liabilities:
Accounts receivable	(690)	(450)
Other current assets	42	338
Accounts payable and accrued liabilities	1,285	(189)
Compensation and benefits payable	(12,406)	(13,963)
Income taxes payable and prepaid income taxes	2,414	(1,557)
Other liabilities	(6)	(37)
Net cash provided by operating activities	13,781	14,597
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(288)	(121)
Net cash used in investing activities	(288)	(121)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchases of treasury stock	(1,289)	(669)
Restricted stock returned for payment of taxes	(5,576)	(5,170)
Excess tax benefits from stock based compensation	1,392	1,893
Cash dividends	(4,855)us-gaap_PaymentsOfDividends	(3,942)us-gaap_PaymentsOfDividends
Net cash used in financing activities	(10,328)	(7,888)
Effect of currency rate changes on cash	(1,689)	(78)
NET INCREASE IN CASH AND CASH EQUIVALENTS	1,476	6,510
Cash and cash equivalents, beginning of period	18,131	10,864
Cash and cash equivalents, end of period	19,607	17,374
Supplemental cash flow information:
Cash paid during the period for income taxes	$ 957us-gaap_IncomeTaxesPaidNet	$ 761us-gaap_IncomeTaxesPaidNet

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