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Note 9 - Credit Facility, Term Loans and Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Mar. 01, 2022 | Dec. 22, 2021 | Dec. 31, 2024 | Mar. 20, 2024 | Feb. 23, 2024 | Dec. 31, 2023 | Aug. 11, 2023 | Dec. 22, 2022
--- | --- | --- | --- | --- | --- | --- | --- | ---
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 16,667 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  | $ 0.0001 | $ 0.0001 |
Warrant Liability | $ 19.0 |  | $ 0.1 |  |  |  |  |
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 |  |  |  |  |  |  |
Midcap Warrant [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 56.4 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 10 years |  |  |  |  |  |
Common Stock Warrants and Prefunded Warrants [Member] | Securities Purchase Agreement [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 |  |  |  |  |  |  |
Prefunded Warrants [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 251,155 |  |  |  |  |  |  |
Common Stock Warrant [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 188,366 |  |  |  |  |  |  |
Line of Credit [Member] | Midcap Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 3 years |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 40.0 |  |  | $ 30.0 |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.50% |  |  |  |  |  |
Line Of Credit Facility, Maximum Liquidity Requirements During Period |  | $ 12.5 |  |  |  |  |  |
Line Of Credit Facility, Maximum Liquidity Requirements At All Other Times |  | $ 15.0 |  |  | 6.8 |  |  | $ 15.0
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | 17.0 |  |  |
Line of Credit [Member] | Midcap Credit Facility [Member] | Term Secured Overnight Financing Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.10% |  |  |  |  |  |
Line of Credit [Member] | Midcap Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 5.50% |  |  |  |  |  |
Asset Backed Credit Facility [Member] | Midcap Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  | $ 0.1 |  |  |

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