Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Sales, net	$ 10,053,000	$ 9,680,000	$ 7,314,000
Cost of sales	4,932,000	4,556,000	4,267,000
Gross profit	5,121,000	5,124,000	3,047,000
Proprietary research and development	1,427,000	1,126,000	1,429,000
Collaboration arrangement, net of reimbursement (Note 14)			45,000
Total research and development	1,427,000	1,126,000	1,474,000
Sales and marketing	2,440,000	2,976,000	2,679,000
General and administrative	4,691,000	4,571,000	4,172,000
(Gain) loss on equipment disposals	9,000		(24,000)
Change in estimate of asset retirement obligation		(73,000)
Total operating expenses	8,567,000	8,600,000	8,301,000
Operating loss	(3,446,000)	(3,476,000)	(5,254,000)
Non-operating income:
Interest income	59,000	30,000	108,000
Other income			2,000
Non-operating income, net	59,000	30,000	110,000
Net loss	(3,387,000)	(3,446,000)	(5,144,000)
Preferred stock dividends	(3,000)	(11,000)	(11,000)
Net loss applicable to common stockholders	$ (3,390,000)	$ (3,457,000)	$ (5,155,000)
Basic and diluted loss per share (in dollars per share)	$ (0.03)	$ (0.05)	$ (0.08)
Weighted average shares used in computing net loss per share:
Basic and diluted (in shares)	103,841	67,601	67,042