CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Income Statement [Abstract]
Net sales	$ 27,009	$ 27,006	$ 51,122	$ 52,065
Cost of sales	17,294	17,663	33,255	34,580
Gross profit	9,715	9,343	17,867	17,485
Operating expenses:
Research and development	790	781	1,589	1,707
Pension expense	925	1,560	1,850	3,120
Selling, general and administrative	5,250	5,529	10,240	10,379
Total operating expenses	6,965	7,870	13,679	15,206
Income from continuing operations before income taxes	2,750	1,473	4,188	2,279
Provision for income taxes	240	280	480	541
Income from continuing operations	2,510	1,193	3,708	1,738
Income (loss) from discontinued operations, net of tax	(213)	(28)	(357)	(101)
Net income	$ 2,297	$ 1,165	$ 3,351	$ 1,637
Earnings per common share - basic:
Income from continuing operations (in dollars per share)	$ 0.77	$ 0.37	$ 1.14	$ 0.54
Income (loss) from discontinued operations (in dollars per share)	$ (0.07)	$ (0.01)	$ (0.11)	$ (0.03)
Net income per common share (in dollars per share)	$ 0.70	$ 0.36	$ 1.03	$ 0.51
Earnings per common share - diluted:
Income from continuing operations (in dollars per share)	$ 0.74	$ 0.36	$ 1.10	$ 0.53
Income (loss) from discontinued operations (in dollars per share)	$ (0.06)	$ (0.01)	$ (0.11)	$ (0.03)
Net income per common share (in dollars per share)	$ 0.68	$ 0.35	$ 0.99	$ 0.50
Weighted average shares outstanding:
Basic (in shares)	3,267	3,221	3,265	3,217
Diluted (in shares)	3,372	3,323	3,375	3,307