Note 10 - Derivative Liabilities - Assumptions (Details)	Apr. 30, 2024 $ / shares	Jul. 31, 2023 $ / shares
Exercise Price in U.S. dollars (in dollars per share)	$ 3.38	$ 3.31
Replacement Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Derivative, measurement input	0.0538
Replacement Warrants [Member] | Measurement Input, Price Volatility [Member]
Derivative, measurement input	0.5123
Replacement Warrants [Member] | Measurement Input, Expected Term [Member]
Derivative, measurement input	0.36
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)	$ 2.45
Replacement Warrants [Member] | Maximum [Member]
Exercise Price in U.S. dollars (in dollars per share)	$ 3.37