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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 06, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 08, 2017
Stock Issued During Period, Shares, New Issues | 10,455 | 17,864 | 6,061 |  |  |  |
Shares Issued, Price Per Share | $ 5.50 | $ 5.15 | $ 8.50 |  |  |  |
Proceeds from Issuance of Common Stock | $ 53,400 | $ 86,250 | $ 47,750 | $ 53,400 | $ 134,000 |  |
Maximum Aggregate Offering Price |  |  |  |  |  |  | $ 200,000

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