Note 11 - Derivative Warrant Liabilities - Assumptions (Details)	Mar. 31, 2022 USD ($) CAD ($)	Mar. 31, 2021 USD ($) CAD ($)
Measurement Input, Exercise Price [Member] | Warrants Issued in May 2018 [Member]
Derivative warrant liability, measurement input	10.48	10.48
Measurement Input, Exercise Price [Member] | Warrants Issued December 2017 [Member]
Derivative warrant liability, measurement input	10.08	10.08
Measurement Input, Share Price [Member] | Warrants Issued in May 2018 [Member]
Derivative warrant liability, measurement input	1.54	6.08
Measurement Input, Share Price [Member] | Warrants Issued December 2017 [Member]
Derivative warrant liability, measurement input	1.22	4.80
Measurement Input, Risk Free Interest Rate [Member] | Warrants Issued in May 2018 [Member]
Derivative warrant liability, measurement input	0.0239	0.0139
Measurement Input, Risk Free Interest Rate [Member] | Warrants Issued December 2017 [Member]
Derivative warrant liability, measurement input	0.0241	0.0092
Measurement Input, Expected Term [Member] | Warrants Issued in May 2018 [Member]
Derivative warrant liability, measurement input	0.0111	0.0211
Measurement Input, Expected Term [Member] | Warrants Issued December 2017 [Member]
Derivative warrant liability, measurement input	0.0074	0.0174
Measurement Input, Price Volatility [Member] | Warrants Issued in May 2018 [Member]
Derivative warrant liability, measurement input	0.8156	1.5600
Measurement Input, Price Volatility [Member] | Warrants Issued December 2017 [Member]
Derivative warrant liability, measurement input	0.8594	1.7112