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Note 12 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Outstanding (in shares)	105,556	105,556
Outstanding, weighted average exercise price (in dollars per share)	$ 9.95	$ 9.95
Outstanding, weighted average remaining contractual life (Year)	3 years 6 months	4 years 6 months	5 years 6 months
Outstanding, aggregate intrinsic value of vested warrants	$ 1,982,342	$ 1,868,341	$ 1,170,616
Issued (in shares)	0	0
Exercised (in shares)	0	0
Expired (in shares)	0	0
Outstanding (in shares)	105,556	105,556	105,556
Outstanding, weighted average exercise price (in dollars per share)	$ 9.95	$ 9.95	$ 9.95