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Note 11 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Outstanding (in shares) 105,556  
Outstanding, weighted average exercise price (in dollars per share) $ 9.95  
Outstanding, weighted average remaining contractual life (Year) 3 years 3 years 6 months
Outstanding, aggregate intrinsic value of vested warrants $ 1,129,449 $ 1,982,342
Issued (in shares) 0  
Exercised (in shares) 0  
Expired (in shares) 0  
Outstanding (in shares) 105,556  
Outstanding, weighted average exercise price (in dollars per share) $ 9.95