4. STOCK-BASED COMPENSATION (Details - Options by exercise price) - $ / shares	9 Months Ended
Mar. 31, 2020	Jun. 30, 2019
Stock Options [Member]
Range of exercise prices	0.27–$1.50
Number of shares outstanding	2,072,800	1,819,500
Weighted average contractual life	6 years 9 months 25 days
Weighted average exercise price	$ 0.95	$ 0.87
Exercisable number of shares	1,449,800
Exercisable weighted average exercise price	$ 0.79
Option 1 [Member]
Range of exercise prices	0.27
Number of shares outstanding	40,000
Weighted average contractual life	1 year 3 months 15 days
Weighted average exercise price	$ 0.27
Exercisable number of shares	40,000
Exercisable weighted average exercise price	$ 0.27
Option 2 [Member]
Range of exercise prices	0.48
Number of shares outstanding	60,000
Weighted average contractual life	6 years
Weighted average exercise price	$ 0.48
Exercisable number of shares	60,000
Exercisable weighted average exercise price	$ 0.48
Option 3 [Member]
Range of exercise prices	0.5
Number of shares outstanding	100,000
Weighted average contractual life	5 years 2 months 19 days
Weighted average exercise price	$ 0.5
Exercisable number of shares	100,000
Exercisable weighted average exercise price	$ 0.5
Option 4 [Member]
Range of exercise prices	0.55
Number of shares outstanding	44,000
Weighted average contractual life	3 years 11 months 15 days
Weighted average exercise price	$ 0.55
Exercisable number of shares	44,000
Exercisable weighted average exercise price	$ 0.55
Option 5 [Member]
Range of exercise prices	0.7
Number of shares outstanding	100,000
Weighted average contractual life	8 years 4 months 6 days
Weighted average exercise price	$ 0.7
Exercisable number of shares	100,000
Exercisable weighted average exercise price	$ 0.7
Option 6 [Member]
Range of exercise prices	0.73
Number of shares outstanding	786,000
Weighted average contractual life	6 years 6 months 21 days
Weighted average exercise price	$ 0.73
Exercisable number of shares	786,000
Exercisable weighted average exercise price	$ 0.73
Option 7 [Member]
Range of exercise prices	0.85
Number of shares outstanding	6,000
Weighted average contractual life	2 years 9 months 3 days
Weighted average exercise price	$ 0.85
Exercisable number of shares	6,000
Exercisable weighted average exercise price	$ 0.85
Option 8 [Member]
Range of exercise prices	0.9
Number of shares outstanding	36,000
Weighted average contractual life	4 years 2 months 8 days
Weighted average exercise price	$ 0.9
Exercisable number of shares	36,000
Exercisable weighted average exercise price	$ 0.9
Option 9 [Member]
Range of exercise prices	1.2
Number of shares outstanding	207,800
Weighted average contractual life	1 year 11 months 1 day
Weighted average exercise price	$ 1.2
Exercisable number of shares	207,800
Exercisable weighted average exercise price	$ 1.2
Option 10 [Member]
Range of exercise prices	1.25
Number of shares outstanding	45,000
Weighted average contractual life	1 year 2 months 30 days
Weighted average exercise price	$ 1.25
Exercisable number of shares	0
Exercisable weighted average exercise price
Option 11 [Member]
Range of exercise prices	1.3
Number of shares outstanding	478,000
Weighted average contractual life	9 years 2 months 12 days
Weighted average exercise price	$ 1.3
Exercisable number of shares	0
Exercisable weighted average exercise price
Option 12 [Member]
Range of exercise prices	1.42
Number of shares outstanding	100,000
Weighted average contractual life	9 years 5 months 12 days
Weighted average exercise price	$ 1.42
Exercisable number of shares	0
Exercisable weighted average exercise price
Option 13 [Member]
Range of exercise prices	1.5
Number of shares outstanding	70,000
Weighted average contractual life	9 years 11 months 15 days
Weighted average exercise price	$ 1.5
Exercisable number of shares	70,000
Exercisable weighted average exercise price	$ 1.5

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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