Note 12 - Derivative Liabilities - Assumptions (Details)	Oct. 31, 2022 $ / shares	Aug. 19, 2022 $ / shares	Aug. 19, 2022 $ / shares	Jul. 31, 2022 $ / shares
Exercise Price (in dollars per share)	$ 2.85			$ 1.92
Replacement Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Derivative, measurement input		0.0000	0.0000
Replacement Warrants [Member] | Minimum [Member]
Exercise Price (in dollars per share) | (per share)		$ 1.06	$ 1.44
Replacement Warrants [Member] | Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Derivative, measurement input		0.0453	0.0453
Replacement Warrants [Member] | Minimum [Member] | Measurement Input, Price Volatility [Member]
Derivative, measurement input		0.9288	0.9288
Replacement Warrants [Member] | Minimum [Member] | Measurement Input, Expected Term [Member]
Derivative, measurement input		0.55	0.55
Replacement Warrants [Member] | Maximum [Member]
Exercise Price (in dollars per share) | (per share)		$ 3.25	$ 4.44
Replacement Warrants [Member] | Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Derivative, measurement input		0.0448	0.0448
Replacement Warrants [Member] | Maximum [Member] | Measurement Input, Price Volatility [Member]
Derivative, measurement input		0.9699	0.9699
Replacement Warrants [Member] | Maximum [Member] | Measurement Input, Expected Term [Member]
Derivative, measurement input		1.85	1.85