Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Net sales	$ 75,211	$ 74,299	$ 138,658	$ 134,469
Cost and expenses:
Cost of sales	49,509	50,036	92,811	90,176
Research and development	7,731	8,884	16,296	18,348
Selling, general and administrative	13,811	12,473	26,083	25,860
	71,051	71,393	135,190	134,384
Income from operations	4,160	2,906	3,468	85
Interest and other, net	4	5	10	19
Income from continuing operations before taxes	4,164	2,911	3,478	104
Income tax provision	277	711	1,311	611
Income (loss) from continuing operations	3,887	2,200	2,167	(507)
Income (loss) from discontinued operations, net of tax (Note 2)	(3,959)	1,963	(4,979)	1,322
Net income (loss)	$ (72)	$ 4,163	$ (2,812)	$ 815
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 0.15	$ 0.09	$ 0.08	$ (0.02)
Income (loss) from discontinued operations (in dollars per share)	(0.15)	0.07	(0.19)	0.05
Net income (loss) (in dollars per share)	0	0.16	(0.11)	0.03
Diluted:
Income (loss) from continuing operations (in dollars per share)	0.15	0.09	0.08	(0.02)
Income (loss) from discontinued operations (in dollars per share)	(0.15)	0.07	(0.19)	0.05
Net income (loss) (in dollars per share)	$ 0	$ 0.16	$ (0.11)	$ 0.03
Weighted average shares used in computing
Basic (in shares)	26,059	25,324	25,905	25,223
Diluted (in shares)	26,722	25,797	26,620	25,223
Cash dividends declared per share (in dollars per share)	$ 0.06	$ 0.06	$ 0.12	$ 0.12