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5. STOCK-BASED COMPENSATION (Details - Stock based compensation) - USD ($)
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Stock based compensation expense $ 71,146 $ 76,505
Cost of Goods Sold [Member]    
Stock based compensation expense 11,233 11,233
Research and Development Expenses [Member]    
Stock based compensation expense 16,925 12,684
Selling, General and Administrative Expenses [Member]    
Stock based compensation expense $ 42,988 $ 52,588