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Note 8 - Stock Options (Details Textual) - $ / shares
3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 46,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 41,800,000 44,470,000 41,965,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 0.10 $ 0.11 $ 0.18
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 3 years 146 days