4. STOCKHOLDERS' EQUITY (Details - Option activity) - Stock Options [Member] - $ / shares	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Stock option activity
Number of stock options outstanding - at beginning	1,819,500	1,055,700
Number of options granted	315,000	831,000
Number of options exercised	(47,500)	(64,500)
Number of options cancelled	(21,800)	(2,700)
Number of options outstanding - at ending	2,065,200	1,819,500	1,055,700
Weighted average exercise price options outstanding- at beginning	$ 0.87	$ 0.76
Weighted average exercise price - grants	1.38	0.99
Weighted average exercise price - exercised	0.62	0.75
Weighted average exercise price - cancelled	0.96	0.86
Weighted average exercise price options outstanding - at end	$ 0.95	$ 0.87	$ 0.76
Weighted average contractual life	6 years 7 months 2 days	7 years 18 days	6 years 1 month 16 days