Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) [Abstract]
Net sales	$ 16,646	$ 15,530
Cost of sales	7,376	6,606
Gross profit	9,270	8,924
Operating expenses
Research and development	1,199	1,197
Sales and marketing	3,696	3,576
Medical device excise tax	128	125
Exit costs	62	0
General and administrative	3,028	2,635
Total operating expenses	8,113	7,533
Operating income	1,157	1,391
Other income
Investment income	1	4
Total other income	1	4
Income from operations before provision for income taxes	1,158	1,395
Provision for income taxes	390	460
Net income	768	935
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.03	$ 0.04
Diluted earnings per share (in dollars per share)	$ 0.03	$ 0.04
Basic weighted average common shares outstanding (in shares)	25,339,983	25,294,020
Diluted weighted average common shares outstanding (in shares)	25,390,181	25,380,940
Net income	768	935
Foreign currency translation adjustment	(505)	175
Comprehensive income	$ 263	$ 1,110