3. STOCKHOLDERS' EQUITY (Details - Option activity) - Stock Options [Member] - $ / shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Stock option activity
Number of stock options outstanding - at beginning	2,065,200	1,819,500
Number of options granted	630,000	315,000
Number of options exercised	(112,000)	(47,500)
Number of options cancelled	(5,000)	(21,800)
Number of options outstanding - at ending	2,578,200	2,065,200	1,819,500
Weighted average exercise price options outstanding- at beginning	$ 0.95	$ 0.87
Weighted average exercise price - grants	1.65	1.38
Weighted average exercise price - exercised	0.57	0.62
Weighted average exercise price - cancelled	1.3	0.96
Weighted average exercise price options outstanding - at end	$ 1.13	$ 0.95	$ 0.87
Weighted average contractual life	6 years 8 months 23 days	6 years 7 months 2 days	7 years 18 days