CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cash flows from operating activities:
Net income	$ 19,989	$ 22,647	$ 27,105
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,044	969	1,050
Amortization of intangible assets	1,872	1,960	1,546
Unrealized losses (gains) on trading investments	(617)	(510)	613
Stock-based compensation expense	16,430	15,954	17,574
Deferred income taxes	7,542	149	(3,285)
Excess tax benefits from stock-based compensation	0	(165)	(1,455)
Other	0	269	(58)
Changes in operating assets and liabilities:
Net sales of investments – trading securities	5,778	16,345	6,684
Accounts receivable	2,161	(3,493)	(5,192)
Other current assets	(4,234)	567	(375)
Accounts payable and accrued liabilities	763	(926)	1,174
Compensation and benefits payable	2,262	(2,848)	2,912
Income taxes payable	(4,816)	(3,655)	6,890
Other liabilities	(165)	129	25
Net cash provided by operating activities	48,009	47,392	55,208
Cash flows from investing activities:
Acquisition of Woodway, net of cash acquired	0	0	(24,133)
Purchases of property, equipment and other	(1,167)	(1,819)	(951)
Proceeds from Sale of Property, Plant, and Equipment	0	9	0
Net cash used in investing activities	(1,167)	(1,810)	(25,084)
Cash flows from financing activities:
Purchases of treasury stock	0	(5,634)	0
Payment for Repurchases of Stock for Benefit Plan	(1,326)	(614)	(1,327)
Restricted stock returned for payment of taxes	(5,328)	(3,857)	(5,648)
Excess tax benefits from stock-based compensation	0	165	1,455
Other Payments to Acquire Businesses	0	(5,562)	0
Cash dividends paid	(21,923)	(19,442)	(16,619)
Net cash used in financing activities	(28,577)	(34,944)	(22,139)
Effect of currency rate changes on cash	2,305	301	(3,376)
Net increase in cash and cash equivalents	20,570	10,939	4,609
Cash and cash equivalents, beginning of year	33,679	22,740	18,131
Cash and cash equivalents, end of year	54,249	33,679	22,740
Supplemental cash flow information:
Cash paid during the year for income taxes	10,770	14,860	11,639
Common stock issued for acquisition	0	3,734	5,292
Non-cash accrued contingent consideration	0	0	9,023
Accrued dividends	9,074	8,446	7,448
Noncash Tenant Improvements	0	1,236	0
Non Cash Accrued PP&E	$ 69	$ 0	$ 0