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4. STOCKHOLDERS' EQUITY (Tables)
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]    
Schedule of stock-based compensation expense
   Three Months
Ended September 30,		 
   2019   2018 
Cost of Goods Sold  $11,233   $– 
Research and Development Expenses   12,684    2,411 
Selling, General and Administrative Expenses   52,588    130,573 
Stock Based Compensation Expense  $76,505   $132,984 
   2019   2018 
Cost of Goods Sold  $11,233   $8,669 
Research and Development Expenses   20,398    15,423 
Selling, General and Administrative Expenses   231,695    28,249 
Stock Based Compensation Expense  $263,326   $52,341 
Assumptions for fair value of options granted  
   Year Ended 
   June 30, 2019 
Assumptions:     
Option life   5.3 years 
Risk-free interest rate   3.0% 
Stock volatility   133% 
Dividend yield   0 
Weighted average fair value of grants  $0.70 
Stock option activity
   Options Outstanding 
   Number of
Shares		   Weighted Average
Exercise Price		   Weighted Average
Contractual Life		 
Outstanding at June 30, 2019   1,819,500   $0.87    7.05 years 
Granted   200,000           
Exercised   (12,500)          
Outstanding at September 30, 2019   2,007,000   $0.92    7.16 years 
    Options Outstanding 
    Number of
Shares		    Weighted
Average
Exercise Price		    Weighted
Average
Contractual
Life		 
Outstanding at July 1, 2017   1,078,400   $0.78    7.01 years 
Grants   40,000   $0.61      
Cancellations   (62,700)  $0.99      
Outstanding at June 30, 2018   1,055,700   $0.76    6.13 years 
Grants   831,000   $0.99      
Exercised   (64,500)  $0.75      
Cancellations   (2,700)  $0.86      
Outstanding at June 30, 2019   1,819,500   $0.87    7.05 years 
Stock options outstanding by exercise price ranges
Range of Exercise
Prices		   Number of
Shares		   Weighted-
Average
Remaining
Contractual Life
(years)		   Weighted-
Average
Exercise
Price		   Exercisable
Number of
Shares		   Exercisable
Weighted-
Average
Exercise
Price		 
$0.27    40,000    1.79   $0.27    40,000   $0.27 
$0.40    15,000    7.58   $0.40    15,000   $0.40 
$0.48    60,000    6.50   $0.48    60,000   $0.48 
$0.50    100,000    5.73   $0.50    100,000   $0.50 
$0.55    44,000    4.46   $0.55    39,000   $0.55 
$0.64    25,000    8.12   $0.64    15,000   $0.64 
$0.70    100,000    8.85   $0.70    100,000   $0.70 
$0.73    791,000    7.05   $0.73    621,500   $0.73 
$0.85    6,000    3.26   $0.85    6,000   $0.85 
$0.90    6,000    4.26   $0.90    6,000   $0.90 
$0.95    30,000    4.78   $0.95    30,000   $0.95 
$1.20    207,800    2.42   $1.20    207,800   $1.20 
$1.30    481,000    9.70   $1.30    –   $1.30 
$1.35    1,200    0.15   $1.35    1,200   $1.35 
$1.42    100,000    9.95   $1.42    –   $1.42 
$0.27–$1.42    2,007,000    7.16   $0.92    1,241,500   $0.76 
Range of
Exercise Prices		  Number of
Shares		   Weighted-
Average
Remaining
Contractual Life
(years)		   Weighted-
Average
Exercise Price		   Exercisable
Number of
Shares		   Exercisable
Weighted-
Average
Exercise Price		 
$0.27    40,000    2.04   $0.27    40,000   $0.27 
$0.40    15,000    7.83   $0.40    10,000   $0.40 
$0.48    60,000    6.75   $0.48    60,000   $0.48 
$0.50    100,000    5.98   $0.50    100,000   $0.50 
$0.55    46,500    4.60   $0.55    41,500   $0.55 
$0.64    25,000    8.37   $0.64    15,000   $0.64 
$0.70    100,000    9.10   $0.70    100,000   $0.70 
$0.73    801,000    7.29   $0.73    631,500   $0.73 
$0.85    6,000    3.51   $0.85    6,000   $0.85 
$0.90    6,000    4.51   $0.90    6,000   $0.90 
$0.95    30,000    5.03   $0.95    30,000   $0.95 
$1.20    207,800    2.67   $1.20    207,800   $1.20 
$1.30    381,000    9.89   $1.30    0   $1.30 
$1.35    1,200    0.40   $1.35    1,200   $1.35 
$0.27–1.35    1,819,500    7.09   $0.87    1,249,000   $0.87