Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Total revenue	$ 326,000	$ 397,000	$ 1,048,000	$ 868,000
Cost of goods sold	149,000	200,000	429,000	414,000
Gross profit	177,000	197,000	619,000	454,000
Operating costs and expenses
Selling, general and administrative	1,065,000	1,180,000	2,138,000	2,345,000
Research and development	76,000	75,000	156,000	153,000
Total operating costs and expenses	1,141,000	1,255,000	2,294,000	2,498,000
Loss from operations	(964,000)	(1,058,000)	(1,675,000)	(2,044,000)
Other income (expense)
Other income (expense), net				(5,000)
Interest expense, net	(38,000)	(2,000)	(62,000)	(4,000)
Total other income (expense)	(38,000)	(2,000)	(62,000)	(9,000)
Net loss	$ (1,002,000)	$ (1,060,000)	$ (1,737,000)	$ (2,053,000)
Basic net loss per share	$ (0.02)	$ (0.02)	$ (0.01)	$ (0.01)
Diluted net loss per share	$ (0.02)	$ (0.02)	$ (0.01)	$ (0.01)
Shares used in computing basic net loss per share	111,856,473	111,356,473	111,856,473	111,356,473
Shares used in computing diluted net loss per share	111,856,473	111,356,473	111,856,473	111,356,473
Product [Member]
Total revenue	$ 325,000	$ 396,000	$ 1,043,000	$ 863,000
Royalty [Member]
Total revenue	$ 1,000	$ 1,000	$ 5,000	$ 5,000