Note 13 - Stock Based Compensation - Activities Within the Stock Option Plan (Details) - Stock Option Plan [Member]	9 Months Ended
	Dec. 31, 2021 $ / shares $ / shares shares	Dec. 31, 2020 $ / shares $ / shares shares
Outstanding, weighted average exercise price (in CAD per share) | $ / shares	$ 8.33	$ 7.97
Outstanding, number of options (in shares) | shares	911,871	1,241,611
Granted, weighted average exercise price (in CAD per share) | $ / shares	$ 2.05	$ 0
Granted, number of options (in shares) | shares	2,077,900	0
Exercised, weighted average exercise price (in CAD per share) | $ / shares	$ 0	$ 0
Exercised, number of options (in shares) | shares	0	0
Forfeited, weighted average exercise price (in CAD per share) | $ / shares	$ 10.39	$ 6.70
Forfeited, number of options (in shares) | shares	(7,995)	(224,560)
Expired, weighted average exercise price (in CAD per share) | $ / shares	$ 0	$ 0
Expired, number of options (in shares) | shares	0	0
Outstanding, weighted average exercise price (in CAD per share) | $ / shares	$ 3.95	$ 9.42
Outstanding, number of options (in shares) | shares	2,981,776	1,017,051
Exercisable, weighted average exercise price (in CAD per share) | $ / shares	$ 8.84	$ 9.42
Exercisable, number of options (in shares) | shares	761,563	661,796