Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) [Abstract]
Net sales	$ 16,135	$ 16,264	$ 46,761	$ 44,939
Cost of sales	7,223	7,213	20,527	22,244
Gross profit	8,912	9,051	26,234	22,695
Operating expenses
Research and development	1,302	973	4,012	2,660
Sales and marketing	3,450	3,523	10,655	10,367
Medical device excise tax	83	115	323	160
Exit costs	64	0	578	0
General and administrative	2,602	2,719	8,240	7,999
Total operating expenses	7,501	7,330	23,808	21,186
Operating income	1,411	1,721	2,426	1,509
Other income (expenses)
Investment income	1	5	7	18
Interest expense	0	(2)	0	(6)
Miscellaneous	0	(12)	0	(35)
Total other income (expenses)	1	(9)	7	(23)
Income from operations before provision for income taxes	1,412	1,712	2,433	1,486
Provision for income taxes	469	562	781	366
Net income	943	1,150	1,652	1,120
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.04	$ 0.05	$ 0.07	$ 0.04
Diluted earnings per share (in dollars per share)	$ 0.04	$ 0.05	$ 0.07	$ 0.04
Basic weighted average common shares outstanding (in shares)	25,331,925	25,299,131	25,311,641	25,229,250
Diluted weighted average common shares outstanding (in shares)	25,392,782	25,362,923	25,388,493	25,329,711
Net income	943	1,150	1,652	1,120
Foreign currency translation adjustment	41	(238)	181	16
Comprehensive income	$ 984	$ 912	$ 1,833	$ 1,136