Note 13 - Capital Stock - Share Purchase Warrants Assumptions (Details) - Warrant Issued with September 2020 Offering [Member]	Jan. 31, 2021 yr
Measurement Input, Risk Free Interest Rate [Member]
Warrants, measurement input	0.0014
Measurement Input, Price Volatility [Member]
Warrants, measurement input	0.7681
Measurement Input, Expected Term [Member]
Warrants, measurement input	2
Measurement Input, Expected Dividend Rate [Member]
Warrants, measurement input	0