Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Sales, net	$ 2,206,000	$ 1,904,000	$ 4,521,000	$ 3,466,000
Cost of sales	1,095,000	1,139,000	2,174,000	2,177,000
Gross profit	1,111,000	765,000	2,347,000	1,289,000
Research and development:
Proprietary research and development	277,000	395,000	510,000	789,000
Collaboration arrangement, net of reimbursement		19,000		45,000
Total research and development	277,000	414,000	510,000	834,000
Sales and marketing	666,000	702,000	1,481,000	1,351,000
(Gain) on equipment disposal		(23,000)		(23,000)
General and administrative	1,071,000	1,101,000	2,168,000	2,074,000
(Gain) on change in estimate of asset retirement obligation (Note 9)			(73,000)
Total operating expenses	2,014,000	2,194,000	4,086,000	4,236,000
Operating loss	(903,000)	(1,429,000)	(1,739,000)	(2,947,000)
Non-operating income:
Interest income, net	6,000	15,000	26,000	25,000
Non-operating income	6,000	15,000	26,000	25,000
Net loss	(897,000)	(1,414,000)	(1,713,000)	(2,922,000)
Preferred stock dividends	(2,000)	(2,000)	(5,000)	(5,000)
Net loss applicable to common shareholders	$ (899,000)	$ (1,416,000)	$ (1,718,000)	$ (2,927,000)
Basic and diluted loss per share (in dollars per share)	$ (0.01)	$ (0.02)	$ (0.03)	$ (0.04)
Weighted average shares used in computing net loss per share:
Basic and diluted (in shares)	67,388	67,331	67,388	66,743