Consolidated Statements Of Stockholders' Equity And Comprehensive Income (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2008	$ 93	$ 37,484	$ 70,287	$ 1,184		$ 109,048
Balance, shares at Dec. 31, 2008	9,335
Stock issued for employee stock plans	1	1,224				1,225
Stock issued for employee stock plans, shares	117
Issuance of restricted stock, shares	20
Net tax benefit/reductions relating to exercise and expiration of stock options		46				46
Stock-based compensation		1,542				1,542
Comprehensive income:
Net income			8,495			8,495
Translation adjustment				(42)		(42)
Change in unrealized gain from available-for-sale securities, net of taxes				(365)		(365)
Total comprehensive income						8,088
Balance at Dec. 31, 2009	94	40,296	78,782	777		119,949
Balance, shares at Dec. 31, 2009	9,472
Stock issued for employee stock plans	1	944				945
Stock issued for employee stock plans, shares	105
Issuance of restricted stock, shares	20
Contribution from noncontrolling interest					588	588
Net tax benefit/reductions relating to exercise and expiration of stock options		(114)				(114)
Stock-based compensation		1,936				1,936
Repurchase of common stock			(1,825)			(1,825)
Repurchase of common stock, shares	(117)
Comprehensive income:
Net income			7,700		(98)	7,602
Translation adjustment				(294)	16	(278)
Change in unrealized gain from available-for-sale securities, net of taxes				(166)		(166)
Total comprehensive income					(82)	7,158
Balance at Dec. 31, 2010	95	43,062	84,657	317	506	128,637
Balance, shares at Dec. 31, 2010	9,480
Stock issued for employee stock plans		278				278
Stock issued for employee stock plans, shares	37
Issuance of restricted stock	1	(1)
Issuance of restricted stock, shares	146
Stock issued in acquistion	10	9,534				9,544
Stock issued in acquistion, shares	1,000
Net tax benefit/reductions relating to exercise and expiration of stock options		(19)				(19)
Stock-based compensation		1,981				1,981
Cash Dividends			(4,595)			(4,595)
Repurchase of common stock	(4)		(6,022)			(6,026)
Repurchase of common stock, shares	(459)
Comprehensive income:
Net income			2,835		(163)	2,672
Translation adjustment				(106)	17	(89)
Change in unrealized gain from available-for-sale securities, net of taxes				(83)		(83)
Total comprehensive income					(146)	2,500
Balance at Dec. 31, 2011	$ 102	$ 54,835	$ 76,875	$ 128	$ 360	$ 132,300
Balance, shares at Dec. 31, 2011	10,204