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Note 11 - Capital Stock (Tables)
3 Months Ended
Mar. 31, 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
     
6.5
    $
1,419,728
 
                                 
Issued
   
-
     
 
     
 
     
 
 
Exercised
   
-
     
 
     
 
     
 
 
Expired
   
-
     
 
     
 
     
 
 
                                 
Outstanding as of March 31, 2019
   
105,556
    $
9.95
     
6.25
    $
1,582,284