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Note 11 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
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 273 days 7 years 182 days
Outstanding, aggregate intrinsic value of vested warrants $ 2,105,842 $ 2,368,677
Issued (in shares)  
Issued, weighted average exercise price (in dollars per share)  
Exercised (in shares)  
Exercised, weighted average exercise price (in dollars per share)  
Expired (in shares)  
Outstanding (in shares) 105,556 105,556
Outstanding, weighted average exercise price (in dollars per share) $ 9.95 $ 9.95