Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 26, 2011
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 53,296	$ 89,700
Cost and expenses:
Cost of sales	37,757	60,885
Research and development	8,370	9,083
Selling, general and administrative	10,876	12,090
Total cost and expenses	57,003	82,058
Income (loss) from operations	(3,707)	7,642
Interest and other, net	92	110
Income (loss) before income taxes	(3,615)	7,752
Income tax provision (benefit)	(391)	1,178
Net income (loss)	$ (3,224)	$ 6,574
Income (loss) per share:
Basic	$ (0.13)	$ 0.27
Diluted	$ (0.13)	$ 0.27
Weighted average shares used in computing income (loss) per share:
Basic	24,353	24,018
Diluted	24,353	24,483
Cash dividends declared per share	$ 0.06	$ 0.06