CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 1,910,900	$ 1,674,300	$ 6,153,800	$ 5,146,900
Cost of revenues	1,054,800	993,100	3,833,200	3,032,900
Gross profit	856,100	681,200	2,320,600	2,114,000
Operating Expenses:
General & administrative	435,100	426,700	1,256,700	1,230,500
Selling	223,900	196,200	664,800	590,400
Research & development	114,100	93,400	334,500	263,000
Total operating expenses	773,100	716,300	2,256,000	2,083,900
Income (loss) from operations	83,000	(35,100)	64,600	30,100
Other income (expense):
Investment income	1,100	300	10,100	5,700
Other	0	200	5,700	(3,000)
Interest expense	(1,200)	(13,700)	(2,200)	(35,900)
Total other income, (expense) net	(100)	(13,200)	13,600	(33,200)
Income (loss) before income taxes (benefit)	82,900	(48,300)	78,200	(3,100)
Income tax expense (benefit):
Current	38,900	2,200	23,400	43,100
Deferred	(21,600)	(13,600)	(7,400)	(43,600)
Total income tax expense (benefit)	17,300	(11,400)	16,000	(500)
Net income (loss)	$ 65,600	$ (36,900)	$ 62,200	$ (2,600)
Basic earnings (loss) per common share	$ .04	$ (.02)	$ .04	$ 0.00
Diluted earnings (loss) per common share	0.04	(0.02)	0.04	0.00
Cash dividends declared per common share	$ .03	$ 0.00	$ .03	$ 0.00