Liquidity and Going Concern (Details Narrative) - USD ($)	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Jul. 31, 2022
Liquidity And Going Concern
Cumulative net loss	$ 130,277,000		$ 129,284,000
Net loss	993,000	$ 796,000
Revenue	471,000	501,000
Net cash provided by (used) in operating and investing activities	939,000
Cash and cash equivalents	$ 2,452,000	$ 1,760,000	$ 3,391,000