Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Income [Abstract]
Net sales	$ 56,266,000	$ 47,790,000	$ 108,860,000	$ 89,923,000
Cost and expenses:
Cost of products sold	37,890,000	32,579,000	72,709,000	60,722,000
Engineering and product development	3,180,000	3,201,000	6,486,000	6,181,000
Selling, general and administrative	8,807,000	7,881,000	17,468,000	15,941,000
Depreciation and amortization	775,000	798,000	1,544,000	1,572,000
Total cost and expenses	50,652,000	44,459,000	98,207,000	84,416,000
Income from operations	5,614,000	3,331,000	10,653,000	5,507,000
Other income (expense):
Amortization of deferred financing costs	(77,000)	(60,000)	(153,000)	(121,000)
Fire related gain (loss), net	277,000	(70,000)	277,000	(108,000)
Interest income		1,000	1,000	1,000
Interest expense	(56,000)	(9,000)	(138,000)	(42,000)
Income from continuing operations before income taxes	5,758,000	3,193,000	10,640,000	5,237,000
Income tax provision	2,142,000	1,130,000	3,422,000	1,898,000
Income from continuing operations	3,616,000	2,063,000	7,218,000	3,339,000
Income (loss) from discontinued operations, net of tax	593,000	(1,049,000)	403,000	(1,199,000)
Net income	$ 4,209,000	$ 1,014,000	$ 7,621,000	$ 2,140,000
Basic net income (loss) per common share
Income from continuing operations	$ 0.80	$ 0.34	$ 1.60	$ 0.55
Income (loss) from discontinued operations, net of tax	$ 0.13	$ (0.17)	$ 0.09	$ (0.20)
Net income	$ 0.93	$ 0.17	$ 1.69	$ 0.35
Diluted net income (loss) per common share
Income from continuing operations	$ 0.79	$ 0.34	$ 1.58	$ 0.55
Income (loss) from discontinued operations, net of tax	$ 0.13	$ (0.17)	$ 0.09	$ (0.20)
Net income	$ 0.92	$ 0.17	$ 1.67	$ 0.35
Shares used in computing basic net income (loss) per common share	4,523,000	6,027,000	4,507,000	6,076,000
Shares used in computing diluted net income (loss) per common share	4,576,000	6,066,000	4,558,000	6,111,000