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Note 13 - Warrant Liability (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 09, 2022 | Dec. 31, 2022 | Nov. 10, 2022 | Dec. 31, 2021 | Nov. 02, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 13, 2019
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 7.70 |  | $ 57.13 |  | $ 57.13 |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 327,000 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 2,306,000 |  | 202,000 |  | 201,000 |  |  |
September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ 1.4 |  | $ 0.5 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.18 |  |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  | $ 1.3 | $ 9.6 | $ 14.2 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.18 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | 9,375,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period, Accounting for Subsequent Stock Split (in shares) | 267,857 |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 803,574 |  |  |  |  |  |  |
Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ 0.3 | $ 0.1 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.18 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | 2,100,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period, Accounting for Subsequent Stock Split (in shares) | 60,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 4,800,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Accounting for Subsequent Stock Split (in shares) | 137,145 |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 2,700,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding, Accounting for Subsequent Stock Split (in shares) | 77,145 |  |  |  |  |  |  |  |
The 2019 Domestic Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  |  |  | $ 4.9 |  | $ 3.1 | $ 3.1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  | $ 1.15 |
Class of Warrant or Right, Outstanding (in shares) |  | 0 |  |  |  |  |  |  |
The 2019 Foreign Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  |  |  | 4.2 |  |  | 2.0
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 0.99 |  |
Class of Warrant or Right, Outstanding (in shares) |  | 0 |  |  |  |  |  |  |
The 2019 Ladenburg Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  |  |  | $ 0.2 |  |  | $ 0.1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 0.99 |  |
Class of Warrant or Right, Outstanding (in shares) |  | 0 |  |  |  |  |  |  |

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