Note 11 - Derivative Warrant Liabilities (Details Textual)		Mar. 31, 2022 $ / shares shares	Mar. 31, 2022 $ / shares shares	Mar. 31, 2021 shares	May 09, 2018 $ / shares shares	Dec. 27, 2017 $ / shares shares
Class of Warrant or Right, Outstanding (in shares)		32,390	32,390	247,881
Warrants Issued in May 2018 [Member]
Class of Warrant or Right, Outstanding (in shares)					1,369,937
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1	1		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares		$ 10.48			$ 10.48
Over-Allotment Option Warrants Issued in May 2018 [Member]
Class of Warrant or Right, Outstanding (in shares)	[1]	824,218	824,218	824,218
Warrants Issued December 2017 [Member]
Class of Warrant or Right, Outstanding (in shares)	[2]	884,120	884,120	884,120
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares			$ 10.08
Over-Allotment Option Warrants Issued December 2017 [Member]
Class of Warrant or Right, Outstanding (in shares)						1,225,366
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares						$ 10.08

[1] Warrants to acquire one common share at an exercise price of CAD $10.48, expiring on May 9, 2023.

[2] Warrants to acquire one common share at an exercise price of $10.08, expiring on December 27, 2022