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Consolidated Balance Sheets (Parentheticals) - $ / shares
Jul. 31, 2021
Jul. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 237,014,273 235,315,337
Common stock, shares outstanding 237,014,273 235,315,337