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Note 10 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 16, 2021 | Jul. 13, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
Stock Repurchased During Period, Shares (in shares) |  |  | 0 | 0 | 0 |
Dividends, Common Stock, Cash |  |  | $ 0 | $ 0 | $ 0 |
Class Of Warrant Or Right, Issued During Period (in shares) |  |  |  |  |  | 11,543,814
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 | $ 0.001 |  |
At-the-market Sales Agreement [Member] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  |  |  |  |
Maximum Aggregate Offering Price | $ 30,000,000 |  |  |  |  |
Maximum Percentage of Gross Proceeds Form Each Sale of Shares, Commission | 3.00% |  |  |  |  |
Shelf Registration [Member] |  |  |  |  |  |
Maximum Aggregate Offering Price |  | $ 300,000,000.0 |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |
Class Of Warrant Or Right, Issued During Period (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 During Period (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) |  |  | 635,663 |  |  |
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, Exercised During Period (in shares) |  |  | 0 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 559,125 |  |  |

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