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Note 13 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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)	4 years 6 months	5 years 6 months	6 years 6 months
Outstanding, aggregate intrinsic value of vested warrants	$ 1,868,341	$ 1,170,616	$ 1,419,728
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