Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
Net sales	$ 1,197,600	$ 2,031,500	$ 2,738,500	$ 3,286,900
Cost of goods sold	707,200	1,162,200	1,644,200	1,909,000
Gross profit	490,400	869,300	1,094,300	1,377,900
Operating expenses:
General and administrative	335,100	310,300	626,100	597,000
Selling	160,100	202,900	349,000	343,300
Research and development	78,700	89,900	125,500	177,400
Total operating expenses	573,900	603,100	1,100,600	1,117,700
Income (loss) from operations	(83,500)	266,200	(6,300)	260,200
Other income:
Interest & other income, net	5,000	6,400	11,800	15,600
Income before income taxes	(78,500)	272,600	5,500	275,800
Income tax expense (benefit):
Current	(21,800)	87,300	(500)	93,900
Deferred	(1,400)	(4,300)	2,000	(9,900)
Total	(23,200)	83,000	1,500	84,000
Net income	$ (55,300)	$ 189,600	$ 4,000	$ 191,800
Basic earnings per common share	$ (0.04)	$ 0.16	$ 0	$ 0.16
Diluted earnings per common share	$ (0.04)	$ 0.16	$ 0	$ 0.16
Cash dividends declared per common share	$ 0	$ 0	$ 0.05	$ 0.09