Note 13 - Capital Stock - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021
Options Outstanding (in shares)	9,063,956	9,063,956	9,323,790	10,404,333
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.20	$ 1.20	$ 1.20	$ 1.21
Options outstanding, weighted average remaining contractual term (Year)	6 years 9 months 3 days
Options exercisable (in shares)	6,498,124
Options exercisable, weighted average exercise price (in dollars per share)	$ 1.14
Options exercisable, weighted average remaining contractual term (Year)	5 years 11 months 23 days
Exercise Price Range 1 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 0.80
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 0.99
Options Outstanding (in shares)	4,794,247
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.92
Options outstanding, weighted average remaining contractual term (Year)	8 years 21 days
Options exercisable (in shares)	3,840,186
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.92
Options exercisable, weighted average remaining contractual term (Year)	7 years 11 months 15 days
Exercise Price Range 2 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 1.00
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 1.49
Options Outstanding (in shares)	2,013,875
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.16
Options outstanding, weighted average remaining contractual term (Year)	5 years 9 months 10 days
Options exercisable (in shares)	1,130,541
Options exercisable, weighted average exercise price (in dollars per share)	$ 1.21
Options exercisable, weighted average remaining contractual term (Year)	3 years 8 months 8 days
Exercise Price Range 3 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 1.50
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 2.89
Options Outstanding (in shares)	2,255,834
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.82
Options outstanding, weighted average remaining contractual term (Year)	4 years 10 months 17 days
Options exercisable (in shares)	1,527,397
Options exercisable, weighted average exercise price (in dollars per share)	$ 1.63
Options exercisable, weighted average remaining contractual term (Year)	2 years 8 months 12 days