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Note 8 - Stock Options (Tables)
9 Months Ended
Mar. 31, 2017
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
Grant
Date
Expiration
Date
 
Exercise
Price
 
 
Balance
Outstanding
June 30, 2016
 
 
Balance
Outstanding
March 31, 2017
 
July 1, 2011
July 1, 2016
  $
0.30
     
3,300,000
     
-
 
July 12, 2012
July 13, 2016
  $
0.29
     
1,650,000
     
-
 
October 24, 2011
October 24, 2016
  $
0.20
     
1,640,000
     
-
 
December 1, 2011
December 1, 2016
  $
0.21
     
1,785,000
     
-
 
March 7, 2012
March 4, 2017
  $
0.28
     
4,900,000
     
-
 
May 23, 2012
May 23, 2017
  $
0.23
     
180,000
     
180,000
 
February 27, 2013
February 27, 2018
  $
0.21
     
4,900,000
     
4,000,000
 
July 9, 2013
July 9, 2018
  $
0.11
     
1,080,000
     
905,000
 
September 19, 2013
July 19, 2018
  $
0.15
     
675,000
     
450,000
 
October 9, 2013
October 9, 2018
  $
0.13
     
250,000
     
250,000
 
January 10, 2014
January 10, 2019
  $
0.18
     
4,400,000
     
4,275,000
 
July 3, 2014
July 3, 2019
  $
0.15
     
4,275,000
     
3,000,000
 
February 26, 2015
February 26, 2020
  $
0.20
     
4,430,000
     
4,400,000
 
December 22, 2015
December 22, 2020
  $
0.06
     
8,500,000
     
8,500,000
 
Total Outstanding
   
 
     
41,965,000
     
25,960,000
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Weighted-Average
Exercise Price ($)
 
 
Number of
Stock Options
 
Outstanding as of June 30, 2015
   
0.22
     
35,365,000
 
Granted
   
0.06
     
8,500,000
 
Exercised
   
-
     
-
 
Expired
   
0.23
     
(1,900,000
)
                 
Outstanding as of June 30, 2016
   
0.18
     
41,965,000
 
Granted
   
-
     
-
 
Exercised
   
-
     
-
 
Expired
   
0.25
     
(16,005,000
)
                 
Outstanding as of March 31, 2017
   
0.14
     
25,960,000