Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Consolidated Statements of Income and Comprehensive Income [Abstract]
Net sales	$ 75,019	$ 64,769	$ 62,796
Cost of sales	34,802	28,540	30,425
Gross profit	40,217	36,229	32,371
Operating expenses
Research and development	4,261	5,158	3,643
Sales and marketing	15,367	14,360	13,805
Medical device excise tax	487	486	289
Exit costs	719	682	0
General and administrative	13,293	10,962	10,913
Total operating expenses	34,127	31,648	28,650
Operating income	6,090	4,581	3,721
Other income (expenses)
Investment income	11	10	31
Interest expense	(82)	(19)	(28)
Miscellaneous	0	(11)	(35)
Total other income (expenses)	(71)	(20)	(32)
Income from continuing operations before provision for income taxes	6,019	4,561	3,689
Provision for income taxes	1,541	1,498	1,130
Net income	$ 4,478	$ 3,063	$ 2,559
Earnings per share:
Basic (in dollars per share)	$ 0.18	$ 0.12	$ 0.10
Diluted (in dollars per share)	$ 0.18	$ 0.12	$ 0.10
Basic weighted average common shares outstanding (in share)	25,362,166	25,323,622	25,243,010
Diluted weighted average common shares outstanding (in share)	25,449,027	25,393,264	25,337,525
Net income	$ 4,478	$ 3,063	$ 2,559
Foreign currency translation adjustment	(1,339)	104	47
Comprehensive income	$ 3,139	$ 3,167	$ 2,606