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Note 11 - Capital Stock (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Shares Under Warrants
   
Weighted Average Exercise Price
   
Weighted Average Remaining Contractual Life (in years)
   
Aggregate Intrinsic Value of Vested Warrants
 
                                 
Outstanding as of December 31, 2018
   
105,556
    $
9.95
     
6.50
    $
1,419,728
 
                                 
Issued
   
-
     
 
     
 
     
 
 
Exercised
   
-
     
 
     
 
     
 
 
Expired
   
-
     
 
     
 
     
 
 
                                 
Outstanding as of September 30, 2019
   
105,556
    $
9.95
     
5.75
    $
1,042,893