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Note 11 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Outstanding (in shares) 105,556  
Outstanding, weighted average exercise price (in dollars per share) $ 9.95  
Outstanding, weighted average remaining contractual life (Year) 4 years 3 months 4 years 6 months
Outstanding, aggregate intrinsic value of vested warrants $ 2,069,953 $ 1,868,341
Issued (in shares) 0  
Exercised (in shares) 0  
Expired (in shares) 0  
Outstanding (in shares) 105,556 105,556
Outstanding, weighted average exercise price (in dollars per share) $ 9.95 $ 9.95