Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Total revenue	$ 501,000	$ 1,591,000
Cost of goods sold	172,000	641,000
Gross Profit	329,000	950,000
Operating costs and expenses
Selling, general and administrative	1,057,000	1,046,000
Research and development	67,000	83,000
Total operating costs and expenses	1,124,000	1,129,000
Loss from operations	(795,000)	(179,000)
Other income (expense)
Interest expense, net	(1,000)	(1,000)
Total other income (expense)	(1,000)	(1,000)
Net loss	$ (796,000)	$ (180,000)
Basic and diluted net loss per share	$ (0.01)	$ (0.00)
Shares used in computing basic and diluted net loss per share	87,432,380	87,072,951
Product [Member]
Total revenue	$ 497,000	$ 1,417,000
Royalty [Member]
Total revenue	$ 4,000	$ 174,000