Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 35,737	$ 43,443	$ 74,457	$ 87,982
Cost of sales	24,395	27,149	48,591	54,055
Gross profit	11,342	16,294	25,866	33,927
Operating Expenses:
Marketing	2,438	2,596	5,033	4,995
Research and development	3,124	3,538	7,049	7,369
General and administrative	4,372	4,628	8,787	9,862
Total operating expenses	9,934	10,762	20,869	22,226
Operating income	1,408	5,532	4,997	11,701
Other income (expense):
Interest expense	(53)	(105)	(133)	(289)
Other, primarily interest income	139	177	279	298
Total other income, net	86	72	146	9
Income before income tax expense	1,494	5,604	5,143	11,710
Income tax expense	320	950	1,440	2,950
Net income	$ 1,174	$ 4,654	$ 3,703	$ 8,760
Earnings per share:
Basic	$ 0.08	$ 0.33	$ 0.26	$ 0.63
Diluted	$ 0.08	$ 0.32	$ 0.25	$ 0.60
Weighted average common shares outstanding:
Basic	14,244	13,961	14,180	13,900
Diluted	14,861	14,720	14,825	14,573