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Note 12 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended
--- | ---
Jan. 31, 2017 | Jun. 30, 2015 | Jun. 30, 2014
Common Stock [Member] |  |  |
Stock Issued During Period, Shares, New Issues |  | 5,500,000 | 4,800,000
Payments of Stock Issuance Costs |  | $ 8.4 |
Subsequent Event [Member] |  |  |
Proceeds from Issuance of Common Stock | $ 163.7 |  |
Subsequent Event [Member] | Common Stock [Member] |  |  |
Stock Issued During Period, Shares, New Issues | 14,100,000 |  |
Share Price | $ 12.20 |  |
Payments of Stock Issuance Costs | $ 8.8 |  |

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