Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Net sales	$ 67,512	$ 91,573	$ 206,170	$ 226,042
Cost and expenses:
Cost of sales	44,718	58,621	137,529	148,797
Research and development	8,605	8,587	24,901	26,935
Selling, general and administrative	11,923	12,358	38,006	38,218
Cost and expenses	65,246	79,566	200,436	213,950
Income from operations	2,266	12,007	5,734	12,092
Interest and other, net	9	6	19	25
Income from continuing operations before taxes	2,275	12,013	5,753	12,117
Income tax provision	940	2,001	2,251	2,612
Income from continuing operations	1,335	10,012	3,502	9,505
Loss from discontinued operations, net of tax (Note 2)	(222)	(2,493)	(5,201)	(1,171)
Net income (loss)	$ 1,113	$ 7,519	$ (1,699)	$ 8,334
Basic:
Income from continuing operations (in dollars per share)	$ 0.05	$ 0.39	$ 0.13	$ 0.38
Loss from discontinued operations (in dollars per share)	(0.01)	(0.09)	(0.20)	(0.05)
Net income (loss) (in dollars per share)	0.04	0.30	(0.07)	0.33
Diluted:
Income from continuing operations (in dollars per share)	0.05	0.38	0.13	0.37
Loss from discontinued operations (in dollars per share)	(0.01)	(0.09)	(0.19)	(0.05)
Net income (loss) (in dollars per share)	$ 0.04	$ 0.29	$ (0.06)	$ 0.32
Weighted average shares used in computing Income (loss) per share:
Weighted average common shares (in shares)	26,175	25,481	25,995	25,309
Diluted (in shares)	26,796	26,174	26,679	25,698
Cash dividends declared per share (in dollars per share)	$ 0.06	$ 0.06	$ 0.18	$ 0.18