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Note 11 - Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Feb. 17, 2022 | Feb. 03, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 27, 2023 | Dec. 31, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 | $ 0.01
Warrants With Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 438,334 |  |  |  |  |  |
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share) | $ 1.2057 |  |  |  |  |  |  |  | 3.2781
Fair Value Adjustment of Warrants |  |  |  |  |  |  | $ 4,950 |  |
Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 1,950,502 |  |  |  |  |  |
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 1,950,502 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 2,388,836 |  |  |  |  |  |  |  |
Class of Warrant or Right, Extension Term (Year) | 1 year |  |  |  |  |  |  |  |
Lender Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 1,731,499 |  | 1,731,499 |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  | 5 years |  | 5 years |  |  |
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share) | $ 1.1097 |  |  |  |  |  |  |  | $ 2.4387
Fair Value Adjustment of Warrants |  |  |  |  |  |  | (2,302) |  |
Debt Instrument, Unamortized Discount, Increase |  |  |  |  |  |  |  |  | $ 4,223
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 6 |  | $ 6 |  |  |
Class of Warrant or Right, Outstanding (in shares) | 1,731,499 |  |  |  |  |  |  |  |
Purchaser Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 466,667 |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |  |
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share) | $ 1.2051 |  |  |  |  |  |  |  | $ 2.5968
Fair Value Adjustment of Warrants |  |  |  |  |  |  | 650 |  |
Class of Warrant or Right, Waiver Fee |  | $ 175 |  |  |  |  |  |  |
Class of Warrant or Right, Stated Price Per Share (in dollars per share) |  | $ 0.375 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.23 |  |  |  |  |  |  |
Warrant Issuance Expense |  | $ 1,211 |  | $ (0) | $ (0) | $ (0) | $ 1,212 |  |
Class of Warrant or Right, Outstanding (in shares) | 466,667 |  |  |  |  |  |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 438,334 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.01 |  |  |  |  |  |
Sale of Common Stock and Warrants, Price Per Share (in dollars per share) |  |  | 4.605 |  |  |  |  |  |
Common Stock and Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |
Sale of Common Stock and Warrants, Price Per Share (in dollars per share) |  |  | $ 4.6047 |  |  |  |  |  |
Common Stock and Warrants [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  | $ 11,000 |  |  |  |  |  |

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