CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Net sales	$ 93,262	$ 71,993
Cost of sales	55,312	43,801
Gross profit	37,950	28,192
Expenses:
Selling	12,923	9,631
General and administrative	12,102	9,118
Research and development	2,145	1,629
Total operating expenses	27,170	20,378
Income before interest and income taxes	10,780	7,814
Interest expense	1,031	241
Interest income	(30)	(19)
Income before income taxes	9,779	7,592
Income taxes	3,559	2,617
Net income	$ 6,220	$ 4,975
Earnings per common share:
Basic (in dollars per share)	$ 0.35	$ 0.29
Diluted (in dollars per share)	$ 0.35	$ 0.29
Dividends per common share (in dollars per share)	$ 0.07	$ 0.06