CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 8,570,300	$ 10,199,800
Cost of revenues	4,716,900	5,832,700
Gross profit	3,853,400	4,367,100
Operating expenses:
General and administrative	2,412,300	1,924,400
Selling	1,436,400	1,136,100
Research and development	1,140,000	530,500
Total operating expenses	4,988,700	3,591,000
Income (loss) from operations	(1,136,300)	776,100
Other income (expense):
Interest income	12,600	3,400
Other income (loss), net	(16,200)	(7,800)
Interest expense	0	(1,500)
Total other income (expense)	(3,600)	(5,900)
Income (loss) before income tax expense (benefit)	(1,139,900)	770,200
Income tax expense (benefit): Current	0	166,600
Income tax expense (benefit): Deferred	(436,600)	(42,000)
Total income tax expense (benefit)	(436,600)	124,600
Net income (loss)	$ (703,300)	$ 645,600
Basic earnings (loss) per common share	$ (.46)	$ 0.43
Diluted earnings (loss) per common share	$ (.46)	$ 0.43
Weighted average common shares outstanding, basic	1,515,103	1,494,112
Weighted average common shares outstanding, assuming dilution (in 2019)	1,515,103	1,512,178