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Note 6 - Stockholders' Equity (Deficiency) (Tables)
9 Months Ended
Sep. 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
   
(3,875,563
)  
 
(0.51)
 
 
                   
Outstanding September 30, 2018
   
128,600
   
 
$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      
128,600
 
October 26, 2018
       
128,600
 
 
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
   
(125,000
)    
(0.42
)
                 
Outstanding September 30, 2018
   
3,610,000
    $
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      
830,000
     
722,000
 
June 4, 2023
  0.50      
1,275,000
     
1,275,000
 
June 4, 2023
         
3,610,000
     
3,232,000