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4. STOCK-BASED COMPENSATION (Details - Option activity) - Stock Options [Member]
9 Months Ended
Mar. 31, 2020
$ / shares
shares
Number of Shares  
Options outstanding, beginning 1,819,500
Options granted 315,000
Options expired or cancelled (47,500)
Options exercised (14,200)
Options outstanding, ending 2,072,800
Weighted Average Exercise Price  
Weighted average exercise price, beginning price | $ / shares $ 0.87
Weighted average exercise price, ending price | $ / shares $ 0.95
Weighted Average Contractual Life  
Weighted Average Contractual Life, beginning 7 years 18 days
Weighted Average Contractual Life, ending 6 years 9 months 25 days