CONSOLIDATED STATEMENTS OF INCOME (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 200,577,000	$ 212,331,000	$ 189,768,000
Cost and expenses:
Cost of products sold	136,542,000	143,420,000	128,011,000
Engineering and product development	11,746,000	12,820,000	12,664,000
Selling, general and administrative	35,820,000	34,426,000	32,819,000
Depreciation and amortization	2,711,000	2,870,000	3,026,000
Restructuring charges	857,000	261,000
Total cost and expenses	187,676,000	193,797,000	176,520,000
Income from operations	12,901,000	18,534,000	13,248,000
Other income (expense):
Amortization of deferred financing costs	(138,000)	(218,000)	(252,000)
Interest income	5,000	3,000	2,000
Interest expense	(48,000)	(179,000)	(86,000)
Fire related gain (loss), net		277,000	(109,000)
Other gain (loss), net	302,000
Income from continuing operations before income taxes	13,022,000	18,417,000	12,803,000
Income tax provision	3,665,000	5,582,000	3,021,000
Income from continuing operations	9,357,000	12,835,000	9,782,000
(Loss) from discontinued operations, net of tax	(1,580,000)	(4,637,000)	(7,226,000)
Net income	$ 7,777,000	$ 8,198,000	$ 2,556,000
Basic net income (loss) per common share
Income from continuing operations	$ 2.17	$ 2.83	$ 1.69
(Loss) from discontinued operations, net of tax	$ (0.37)	$ (1.02)	$ (1.25)
Net income	$ 1.80	$ 1.81	$ 0.44
Diluted net income (loss) per common share
Income from continuing operations	$ 2.16	$ 2.80	$ 1.68
(Loss) from discontinued operations, net of tax	$ (0.36)	$ (1.01)	$ (1.24)
Net income	$ 1.80	$ 1.79	$ 0.44
Shares used in computing basic net income (loss) per common share	4,313,000	4,535,000	5,775,000
Shares used in computing diluted net income (loss) per common share	4,330,000	4,573,000	5,811,000