Note 10 - Derivative Liabilities - Assumptions (Details)	Oct. 31, 2023 $ / shares	Jul. 31, 2023 $ / shares
Exercise Price in U.S. dollars (in dollars per share)	$ 3.31	$ 3.31
Replacement Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Derivative, measurement input	0.054
Replacement Warrants [Member] | Measurement Input, Price Volatility [Member]
Derivative, measurement input	0.5173
Replacement Warrants [Member] | Measurement Input, Expected Term [Member]
Derivative, measurement input	0.85
Replacement Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Derivative, measurement input	0
Replacement Warrants [Member] | Minimum [Member]
Exercise Price in U.S. dollars (in dollars per share)	$ 2.32
Replacement Warrants [Member] | Maximum [Member]
Exercise Price in U.S. dollars (in dollars per share)	$ 3.2