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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Apr. 24, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Apr. 13, 2020
Operating Loss Carryforwards, Total |  | $ 280 |  |
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 |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |
Number of Shares Per Right (in shares) | 1.001 |  |  |
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 |  |  |
Out-of-the-money Warrants [Member] |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 5,923,399 | 5,923,399 |
Series A Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 57.06 | $ 57.06 |
Series B Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | 62.28 | 62.28 |
GLF Equity Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 100.00 | $ 100.00 |
In-the-money Warrants and Restricted Stock Units [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  | 2,488,752 | 3,397,110 |

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