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Note 11 - Capital Stock (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Share-based Compensation, Stock Options, 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, 2017
   
105,556
    $
9.95
   
7.5
    $
2,368,677
 
                               
Issued
   
-
     
 
   
 
     
 
 
Exercised
   
-
     
 
   
 
     
 
 
Expired
   
-
     
 
   
 
     
 
 
                               
Outstanding as of June 30, 2018
   
105,556
    $
9.95
   
7.0
    $
1,173,783