Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Apr. 30, 2023	Jul. 31, 2022
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	376,547,894	289,638,307
Common stock, shares outstanding (in shares)	376,547,894	289,638,307