4. STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Schedule of stock-based compensation expense

	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 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		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