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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 21, 2019 | Nov. 18, 2019 | Aug. 06, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 08, 2017
Maximum Aggregate Offering Price |  |  |  |  |  |  | $ 200,000
Stock Issued During Period, Shares, New Issues |  | 43,621 | 10,455 |  |  |  |
Shares Issued, Price Per Share | $ 1.69 | $ 1.45 | $ 5.50 |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 53,500 | $ 53,400 | $ 58,500 | $ 53,400 | $ 134,000 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 11,765 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.01 |  |  |  |  |  |
Proceeds from Issuance of Warrants | $ 19,882 |  |  | $ 19,882 |  |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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