CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 1,747,800	$ 1,876,900	$ 3,183,900	$ 3,228,600
Cost of sales	929,700	1,046,600	1,771,600	1,934,000
Gross profit	818,100	830,300	1,412,300	1,294,600
Operating expenses:
General and administrative	342,900	309,600	645,900	589,200
Selling	207,900	191,100	404,900	347,400
Research and development	90,800	135,100	188,000	255,200
Total operating expenses	641,600	635,800	1,238,800	1,191,800
Income from operations	176,500	194,500	173,500	102,800
Other income (expense):
Investment income	5,400	3,100	8,500	5,900
Other	2,200	(1,600)	5,900	900
Interest expense	(1,000)	(1,300)	(1,800)	(2,700)
Total other income, net	6,600	200	12,600	4,100
Income before income taxes	183,100	194,700	186,100	106,900
Income tax expense (benefit): Current	44,800	51,800	41,700	21,200
Deferred	3,200	4,500	7,200	9,500
Total income tax expense	48,000	56,300	48,900	30,700
Net income	$ 135,100	$ 138,400	$ 137,200	$ 76,200
Basic earnings per common share	$ 0.10	$ 0.10	$ 0.10	$ 0.06
Diluted earnings per common share	$ 0.10	$ 0.10	$ 0.10	$ 0.06
Cash dividends declared per common share	$ 0.00	$ 0.00	$ 0.08	$ 0.03