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4. STOCK-BASED COMPENSATION (Details - Option activity) - Stock Options [Member]
3 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of Shares  
Options outstanding, beginning 1,819,500
Options granted 200,000
Options expired or cancelled 0
Options exercised (12,500)
Options outstanding, ending 2,007,000
Weighted Average Exercise Price  
Weighted average exercise price, beginning price | $ / shares $ 0.87
Weighted average exercise price, ending price | $ / shares $ 0.92
Weighted Average Contractual Life  
Weighted Average Contractual Life, beginning 7 years 18 days
Weighted Average Contractual Life, ending 7 years 1 month 28 days