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Note 11 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Outstanding (in shares) 105,556  
Outstanding, weighted average exercise price (in dollars per share) $ 9.95  
Outstanding, weighted average remaining contractual life (Year) 6 years 6 years 182 days
Outstanding, aggregate intrinsic value of vested warrants $ 1,393,339 $ 1,419,728
Issued (in shares)  
Exercised (in shares)  
Expired (in shares)  
Outstanding (in shares) 105,556 105,556
Outstanding, weighted average exercise price (in dollars per share) $ 9.95 $ 9.95