Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Sales, net	$ 9,680,000	$ 7,314,000	$ 5,923,000
Cost of sales	4,556,000	4,267,000	4,081,000
Gross profit	5,124,000	3,047,000	1,842,000
Research and development
Proprietary research and development	1,126,000	1,429,000	1,351,000
Collaboration arrangement, net of reimbursement (Note 14)		45,000	395,000
Total research and development	1,126,000	1,474,000	1,746,000
Sales and marketing	2,976,000	2,679,000	2,660,000
General and administrative	4,571,000	4,172,000	4,165,000
Gain on equipment disposals		(24,000)
Change in estimate of asset retirement obligation	(73,000)
Total operating expenses	8,600,000	8,301,000	8,571,000
Operating loss	(3,476,000)	(5,254,000)	(6,729,000)
Non-operating income:
Interest income	30,000	108,000	29,000
Other income		2,000
Non-operating income, net	30,000	110,000	29,000
Net loss	(3,446,000)	(5,144,000)	(6,700,000)
Preferred stock dividends	(11,000)	(11,000)	(11,000)
Net loss applicable to common stockholders	$ (3,457,000)	$ (5,155,000)	$ (6,711,000)
Basic and diluted loss per share (in dollars per share)	$ (0.05)	$ (0.08)	$ (0.12)
Weighted average shares used in computing net loss per share:
Basic and diluted (in shares)	67,601	67,042	55,159