Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Condensed Consolidated Statements of Income and Comprehensive Income [Abstract]
Net sales	$ 15,530	$ 14,620
Cost of sales	6,606	6,147
Gross profit	8,924	8,473
Operating expenses
Research and development	1,197	861
Sales and marketing	3,576	3,263
Medical device excise tax	125	0
General and administrative	2,635	2,408
Total operating expenses	7,533	6,532
Operating income	1,391	1,941
Other income (expenses)
Investment income	4	7
Miscellaneous	0	(3)
Total other income (expenses)	4	4
Income from operations before provision for income taxes	1,395	1,945
Provision for income taxes	460	593
Net income	935	1,352
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.04	$ 0.05
Diluted earnings per share (in dollars per share)	$ 0.04	$ 0.05
Basic weighted average common shares outstanding (in shares)	25,294,020	25,160,757
Diluted weighted average common shares outstanding (in shares)	25,380,940	25,286,184
Net income	935	1,352
Foreign currency translation adjustment	175	70
Comprehensive income	$ 1,110	$ 1,422