Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Total revenue	$ 561,000	$ 2,221,000	$ 3,068,000	$ 2,968,000
Cost of goods sold	246,000	972,000	1,250,000	1,270,000
Gross profit	315,000	1,249,000	1,818,000	1,698,000
Operating costs and expenses
Selling, general and administrative	1,036,000	690,000	3,136,000	2,790,000
Research and development	89,000	85,000	265,000	227,000
Total operating costs and expenses	1,125,000	775,000	3,401,000	3,017,000
Loss from operations	(810,000)	474,000	(1,583,000)	(1,319,000)
Other income (expense)
Interest expense, net	(1,000)	(1,000)	(3,000)	(4,000)
Other income, net				5,000
Total other income (expense)	(1,000)	(1,000)	(3,000)	1,000
Net income (loss)	$ (811,000)	$ 473,000	$ (1,586,000)	$ (1,318,000)
Net income (loss) per common share-basic	$ (0.01)	$ 0.01	$ (0.02)	$ (0.02)
Net income (loss) per common share-diluted	$ (0.01)	$ 0.01	$ (0.02)	$ (0.02)
Weighted average shares-basic	87,223,141	83,979,076	87,157,857	80,634,951
Weighted average shares-diluted	87,223,141	85,702,650	87,157,857	80,634,951
Net Product Sales [Member]
Total revenue	$ 556,000	$ 2,221,000	$ 2,841,000	$ 2,968,000
Royalty Revenue [Member]
Total revenue	$ 5,000		$ 227,000