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Note 6 - Stockholders' Equity (Deficiency) (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
             
   
Number of
warrants
   
Weighted average
exercise price
 
Outstanding, December 31, 2016
   
-
    $
-
 
                 
Granted
   
2,323,779
     
0.43 - 0.49
 
Granted
   
2,887,895
     
0.44 - 0.52
 
Granted
   
128,600
     
0.44 - 0.52
 
Exercised
   
(121,111
)    
(0.43
)
                 
Outstanding, December 31, 2017
   
5,219,163
     
0.48
 
                 
Granted
   
-
     
-
 
Exercised
   
(1,215,000
)    
(0.50
)
Expired, unexercised
   
(1,002,668
)    
(0.48
)
                 
Outstanding June 30, 2018
   
3,001,495
    $
0.52
 
Schedule of Stockholders' Equity Note, Warrants or Rights, by Exercise Price Range [Table Text Block]
           
Range of exercise
prices per share
   
Number of
outstanding
warrants
 
Expiry date
0.52      
2,872,895
 
September 28, 2018
0.52      
128,600
 
October 26, 2018
       
3,001,495
 
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
             
   
Number of options
   
Weighted
average exercise
price
 
Outstanding, December 31, 2016
   
1,010,000
    $
0.42
 
                 
Granted
   
725,000
     
0.42
 
Exercised
   
-
     
-
 
Cancelled
   
(130,000
)    
(0.42
)
                 
Outstanding December 31, 2017
   
1,605,000
     
0.42
 
                 
Granted
   
2,130,000
     
0.47
 
Exercised
   
-
     
-
 
Cancelled
   
(100,000
)    
(0.42
)
                 
Outstanding June 30, 2018
   
3,635,000
    $
0.45
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
                 
Range of exercise
prices per share
   
Number
outstanding
   
Number
exercisable
 
Expiry date
$ 0.42      
855,000
     
855,000
 
December 20, 2021
  0.42      
650,000
     
380,000
 
November 8, 2022
  0.42      
855,000
     
724,500
 
June 4, 2023
  0.50      
1,275,000
     
1,275,000
 
June 4, 2023
         
3,635,000
     
3,234,500