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Note 10 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 04, 2022 | Sep. 29, 2022 | Mar. 01, 2022 | Dec. 31, 2023 | Dec. 22, 2021
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 16,667
Securities Purchase Agreement [Member] | Common Stock Warrants and Prefunded Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 402,271 |  |
Class of Warrant or Right, Sale Price (in dollars per share) |  |  | $ 34.92 |  |
Securities Purchase Agreement [Member] | Prefunded Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 251,155 |  |
Securities Purchase Agreement [Member] | Common Stock Warrant [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 188,366 |  |
Securities Purchase Agreement [Member] | Private Placement [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 536,361 |  |
Stock and Warrants, Combined Issuance Price (in dollars per share) |  |  | $ 34.92 |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 27.5 |  |
Securities Purchase Agreement [Member] | Registered Direct Offering [Member] |  |  |  |  |
Gain (Loss) on Issuance of Equity |  |  |  | $ (12.8) |
September Purchase Agreements [Member] | Common Stock Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 886,920 |  |  |
September Purchase Agreements [Member] | Common Stock Warrants [Member] | Accredited Purchasers [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 877,197 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |
September Purchase Agreements [Member] | Common Stock Warrants [Member] | Insiders [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 9,722 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |
September Purchase Agreements [Member] | Registered Direct Offering [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 886,920 | 886,920 |  |  |
Proceeds from Issuance of Common Stock | $ 20.2 |  |  |  |
September Purchase Agreements [Member] | Registered Direct Offering [Member] | Accredited Purchasers [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 877,197 |  |  |
Stock and Warrants, Combined Issuance Price (in dollars per share) |  | $ 22.8 |  |  |
September Purchase Agreements [Member] | Registered Direct Offering [Member] | Insiders [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 9,722 |  |  |
Stock and Warrants, Combined Issuance Price (in dollars per share) |  | $ 25.2 |  |  |

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