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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 24, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 13, 2020
Stock Repurchased During Period, Shares (in shares) |  | 0 | 0 | 0 |  |
Dividends, Common Stock, Cash |  | $ 0 | $ 0 | $ 0 |  |
Class Of Warrant Or Right Issued (in shares) |  |  |  |  | 11,543,814 |
Percentage of Ownership of Outstanding Common Stock, Subject to Dilution |  |  |  |  |  | 4.99%
Percentage of Additional Ownership Over 4.99% in Otustanding Common Stock, Subject to Dilution |  |  |  |  |  | 0.50%
Number of Rights Issued Per Common Stock Owned (in shares) | 1 |  |  |  |  |
Preferred Stock, No Par Value (in dollars per share) |  | $ 0 | $ 0 |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |  |
Number of Shares Per Right (in shares) | 0.001 |  |  |  |  |
Preferred Stock, No Par Value (in dollars per share) | $ 0 |  |  |  |  |
Shares Issued, Price Per One One Thousandths of a Share (in dollars per share) | 38.00 |  |  |  |  |
Redemption Price, Per Right (in dollars per share) | $ 0.001 |  |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | $ 320,700 | $ 300,000 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | 110,900 |  |  |  |
Tax Credit Carryforward, Amount |  | $ 387,400 |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |
Class Of Warrant Or Right Issued (in shares) |  |  |  |  | 2,432,432 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 57.06 |
Class of Warrant or Right, Exercised During Period (in shares) |  | 0 |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |
Class Of Warrant Or Right Issued (in shares) |  |  |  |  | 2,629,657 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 62.28 |
Class of Warrant or Right, Exercised During Period (in shares) |  | 0 |  |  |  |
New Creditor Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.01 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 657,203 |  |  |  |
Class Of Warrant Or Right, Assumed During Period (in shares) |  | 2,300,000 |  |  |  |
Equity Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 100 |  |  |  |
Class Of Warrant Or Right, Assumed During Period (in shares) |  | 800,000 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1.1 |  |  |  |
GLF Equity Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 815,575 |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 0 |  |  |  |

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