Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Income [Abstract]
Net sales	$ 52,092,000	$ 49,141,000	$ 160,952,000	$ 139,064,000
Cost and expenses:
Cost of products sold	36,011,000	33,120,000	108,720,000	93,842,000
Engineering and product development	3,447,000	3,386,000	9,933,000	9,567,000
Selling, general and administrative	8,440,000	8,756,000	25,908,000	24,697,000
Depreciation and amortization	656,000	709,000	2,200,000	2,281,000
Total cost and expenses	48,554,000	45,971,000	146,761,000	130,387,000
Income from operations	3,538,000	3,170,000	14,191,000	8,677,000
Other income (expense):
Amortization of deferred financing costs	(32,000)	(61,000)	(185,000)	(182,000)
Fire related (loss) gain, net		(1,000)	277,000	(109,000)
Interest income		1,000	1,000	2,000
Interest expense	(33,000)	(7,000)	(171,000)	(49,000)
Income from continuing operations before income taxes	3,473,000	3,102,000	14,113,000	8,339,000
Income tax provision	936,000	777,000	4,358,000	2,675,000
Income from continuing operations	2,537,000	2,325,000	9,755,000	5,664,000
(Loss) income from discontinued operations, net of tax	(261,000)	(267,000)	142,000	(1,466,000)
Net income	$ 2,276,000	$ 2,058,000	$ 9,897,000	$ 4,198,000
Basic net income (loss) per common share
Income from continuing operations	$ 0.56	$ 0.38	$ 2.16	$ 0.93
(Loss) income from discontinued operations, net of tax	$ (0.06)	$ (0.04)	$ 0.03	$ (0.24)
Net income	$ 0.50	$ 0.34	$ 2.19	$ 0.69
Diluted net income (loss) per common share
Income from continuing operations	$ 0.55	$ 0.38	$ 2.14	$ 0.93
(Loss) income from discontinued operations, net of tax	$ (0.05)	$ (0.04)	$ 0.03	$ (0.24)
Net income	$ 0.50	$ 0.34	$ 2.17	$ 0.69
Shares used in computing basic net income (loss) per common share	4,556,000	6,043,000	4,524,000	6,065,000
Shares used in computing diluted net income (loss) per common share	4,591,000	6,079,000	4,570,000	6,100,000