4. STOCKHOLDERS' EQUITY (Details - Option activity) - Stock Options [Member] - $ / shares	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Stock option activity
Number of stock options outstanding - at beginning	1,055,700	1,078,400
Number of options granted	831,000	40,000
Number of options exercised	(64,500)
Number of options cancelled	(2,700)	(62,700)
Number of options outstanding - at ending	1,819,500	1,055,700	1,078,400
Weighted average exercise price options outstanding- at beginning	$ 0.76	$ 0.78
Weighted average exercise price - grants	0.99	0.61
Weighted average exercise price - exercised	0.75
Weighted average exercise price - cancelled	0.86	0.99
Weighted average exercise price options outstanding - at end	$ 0.87	$ 0.76	$ 0.78
Weighted average contractual life	7 years 1 month 2 days	6 years 1 month 16 days	7 years 4 days

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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.

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Number of share options (or share units) exercised during the current period.

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