Consolidated Statement Of Changes In Shareholders' Equity And Comprehensive Income (USD $) In Thousands	Preferred Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning Balance at Jan. 01, 2011		$ 26	$ 44,001	$ 71,132	$ (135)	$ 115,024
Beginning Balance, shares at Jan. 01, 2011		25,523
Shares issued, other comp
Shares issued, other comp, shares		11
Shares issued, stock options			61			61
Shares issued, stock options, shares		11
Shares issued, ESPP			408			408
Shares issued, ESPP, shares		17
Shares issued, shared distribution			2,412			2,412
Shares issued, shared distribution, shares		93
Stock-based compensation			1,218			1,218
Dividends declared				(8,062)		(8,062)
Comprehensive income:
Net income				31,604		31,604
Foreign currency translation adjustments					(657)	(657)
Unrealized loss on available-for-sale securities					(532)	(532)
Comprehensive income						30,415
Ending Balance at Oct. 01, 2011		$ 26	$ 48,100	$ 94,674	$ (1,324)	$ 141,476
Ending Balance, shares at Oct. 01, 2011		25,655