CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 2,683,800	$ 2,028,200	$ 4,242,900	$ 3,472,600
Cost of revenues	1,888,900	1,190,500	2,778,400	2,039,800
Gross profit	794,900	837,700	1,464,500	1,432,800
Operating Expenses:
General & administrative	409,200	395,700	821,600	803,900
Selling	224,200	227,200	440,900	394,200
Research & development	105,000	84,100	220,400	169,500
Total operating expenses	738,400	707,000	1,482,900	1,367,600
Income (loss) from operations	56,500	130,700	(18,400)	65,200
Other income (expense):
Interest income	8,800	5,000	9,100	5,400
Other	400	1,400	5,700	(3,300)
Interest expense	(900)	(14,000)	(1,100)	(22,100)
Total other income, (expense) net	8,300	(7,600)	13,700	(20,000)
Income (loss) before income tax expense (benefit)	64,800	123,100	(4,700)	45,200
Income tax expense (benefit):
Current	20,900	40,900	(15,400)	40,900
Deferred	(1,400)	(12,200)	14,100	(30,000)
Total income tax expense (benefit)	19,500	28,700	(1,300)	10,900
Net income (loss)	$ 45,300	$ 94,400	$ (3,400)	$ 34,300
Basic and diluted earnings per common share	$ .03	$ .06	$ .00	$ .02
Cash dividends declared per common share	$ .03	$ 0.00	$ .03	$ 0.00