CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenues	$ 2,028,200	$ 1,691,100	$ 3,472,600	$ 3,353,200
Cost of sales	1,190,500	1,081,700	2,039,800	2,163,900
Gross profit	837,700	609,400	1,432,800	1,189,300
Operating expenses:
General & administrative	395,700	446,400	803,900	852,600
Selling	227,200	229,400	394,200	524,700
Research & development	84,100	116,100	169,500	223,200
Total operating expenses	707,000	791,900	1,367,600	1,600,500
Income (loss) from operations	130,700	(182,500)	65,200	(411,200)
Other income (expense):
Investment income	5,000	7,400	5,400	9,600
Other	1,400	(5,900)	(3,300)	(1,100)
Interest expense	(14,000)	(1,400)	(22,100)	(2,700)
Total other income, (expense) net	(7,600)	100	(20,000)	5,800
Income (loss) before income tax expense (benefit)	123,100	(182,400)	45,200	(405,400)
Income tax expense (benefit): Current	40,900	(33,800)	40,900	(91,000)
Income tax expense (benefit): Deferred	(12,200)	(10,600)	(30,000)	(15,100)
Total income tax expense (benefit)	28,700	(44,400)	10,900	(106,100)
Net income (loss)	$ 94,400	$ (138,000)	$ 34,300	$ (299,300)
Basic and diluted earnings (loss) per common share	$ .06	$ (.09)	$ .02	$ (.20)