Note 15 - Stock-based Compensation - Outstanding and Exercisable Options (Details)	12 Months Ended
	Mar. 31, 2022 $ / shares shares
Weighted average remaining contractual life (Year)	8 years 7 months 13 days
Number of options outstanding (in shares)	2,989,381
Number of options exercisable (in shares)	989,911
Exercise Price Range 1 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 1.64
Upper limit, exercise price (in CAD per share) | $ / shares	$ 1.84
Weighted average remaining contractual life (Year)	9 years 10 months 17 days
Number of options outstanding (in shares)	37,500
Number of options exercisable (in shares)	0
Exercise Price Range 2 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 1.85
Upper limit, exercise price (in CAD per share) | $ / shares	$ 3.15
Weighted average remaining contractual life (Year)	9 years 7 months 13 days
Number of options outstanding (in shares)	2,050,399
Number of options exercisable (in shares)	190,701
Exercise Price Range 3 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 3.16
Upper limit, exercise price (in CAD per share) | $ / shares	$ 5.20
Weighted average remaining contractual life (Year)	8 years
Number of options outstanding (in shares)	298,376
Number of options exercisable (in shares)	211,095
Exercise Price Range 4 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 5.21
Upper limit, exercise price (in CAD per share) | $ / shares	$ 8.20
Weighted average remaining contractual life (Year)	6 years 3 months 3 days
Number of options outstanding (in shares)	190,819
Number of options exercisable (in shares)	190,819
Exercise Price Range 5 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 8.21
Upper limit, exercise price (in CAD per share) | $ / shares	$ 11.36
Weighted average remaining contractual life (Year)	7 years 14 days
Number of options outstanding (in shares)	206,445
Number of options exercisable (in shares)	191,454
Exercise Price Range 6 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 11.37
Upper limit, exercise price (in CAD per share) | $ / shares	$ 12.84
Weighted average remaining contractual life (Year)	1 year 1 month 9 days
Number of options outstanding (in shares)	65,625
Number of options exercisable (in shares)	65,625
Exercise Price Range 7 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 12.85
Upper limit, exercise price (in CAD per share) | $ / shares	$ 13.68
Weighted average remaining contractual life (Year)	4 years 10 months 24 days
Number of options outstanding (in shares)	13,542
Number of options exercisable (in shares)	13,542
Exercise Price Range 8 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 13.69
Upper limit, exercise price (in CAD per share) | $ / shares	$ 15.04
Weighted average remaining contractual life (Year)	5 years 2 months 12 days
Number of options outstanding (in shares)	90,313
Number of options exercisable (in shares)	90,313
Exercise Price Range 9 [Member]
Lower limit, exercise price (in CAD per share) | $ / shares	$ 15.05
Upper limit, exercise price (in CAD per share) | $ / shares	$ 38.40
Weighted average remaining contractual life (Year)	1 year 18 days
Number of options outstanding (in shares)	36,362
Number of options exercisable (in shares)	36,362