CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Net sales	$ 1,626,100	$ 1,519,500	$ 4,854,700	$ 4,258,000
Cost of sales	810,700	920,500	2,744,700	2,564,700
Gross profit	815,400	599,000	2,110,000	1,693,300
Operating expenses:
General and administrative	320,800	318,900	910,000	945,000
Selling	188,600	170,800	536,000	519,800
Research and development	100,800	125,000	356,000	250,500
Total operating expenses	610,200	614,700	1,802,000	1,715,300
Income (loss) from operations	205,200	(15,700)	308,000	(22,000)
Other income (expense):
Investment income	5,700	2,900	11,600	10,000
Other	600	3,100	1,500	9,000
Interest expense	(1,100)	(1,700)	(3,800)	(2,900)
Total Other Income	5,200	4,300	9,300	16,100
Income (loss) before income tax expense (benefit)	210,400	(11,400)	317,300	(5,900)
Income tax expense (benefit):
Current	53,600	(2,900)	74,800	(3,400)
Deferred	6,700	(300)	16,200	1,700
Total income (loss) tax expense (benefit)	60,300	(3,200)	91,000	(1,700)
Net income (loss)	$ 150,100	$ (8,200)	$ 226,300	$ (4,200)
Basic earnings (loss) per common share	$ 0.11	$ (0.01)	$ 0.17	$ 0.00
Diluted earnings (loss) per common share	$ 0.11	$ (0.01)	$ 0.17	$ 0.00
Cash dividends declared per common share	$ 0.00	$ 0.00	$ 0.03	$ 0.05