Condensed Consolidated Statements of Earnings (unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Earnings (unaudited)
Net sales	$ 74,687	$ 61,458	$ 147,695	$ 121,361
Cost of sales	52,926	42,342	105,154	84,831
Gross margin	21,761	19,116	42,541	36,530
Selling expenses	4,151	3,647	8,289	7,473
Research and development expenses	733	670	1,609	1,538
General and administrative expenses	2,818	2,358	5,286	4,584
Operating Expenses	7,702	6,675	15,184	13,595
Earnings from operations	14,059	12,441	27,357	22,935
Interest income	(69)	(69)	(140)	(140)
Interest expense	22	18	40	40
Other, net	(246)	(59)	(271)	(177)
Earnings before income tax expense	14,352	12,551	27,728	23,212
Income tax expense	4,780	4,212	9,244	7,844
Net earnings	$ 9,572	$ 8,339	$ 18,484	$ 15,368
Net earnings per common share - basic (in dollars per share)	$ 0.34	$ 0.30	$ 0.65	$ 0.55
Net earnings per common share - diluted (in dollars per share)	$ 0.32	$ 0.28	$ 0.61	$ 0.52