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 |