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Note 14 - Capital Structure (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2023 | Aug. 11, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Sep. 28, 2021 | Jun. 04, 2021 | Jun. 08, 2020
Common Stock, Shares Authorized (in shares) |  |  | 200,000,000 |  | 200,000,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 |  | $ 0.0001 |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  | 50,000,000 |  | 50,000,000 |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 |  | $ 0.0001 |  |  |
Common Stock, Shares, Outstanding (in shares) |  |  | 5,567,347 |  | 5,517,174 |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 86 | $ 11,573 |  |  |  |
Payments of Stock Issuance Costs |  |  | 160 | $ 1,000 |  |  |  |
August 2022 Prefunded Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 87,500 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.02 |  |  |  |  |  |
August 2022 Common Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 1,265,547 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 8.6 |  | $ 3.3 | $ 2.32 |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |
August 2022 Common and Prefunded Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) |  | $ 8.58 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |
Warrants and Rights Outstanding |  | $ 6,000 |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 430,217 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.0001 |  |  |  |  |  |  |
Tranche A Common Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,173,912 |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |  |
Tranche B Common Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,173,912 |  |  |  |  |  |  |
Common Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.59 |  |  |  |  |  |  |
Common Warrants Exchanged for PreFunded Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | 1.5899 |  |  |  |  |  |  |
Tranche A Common Warrants at Double Exercise Price [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 3.18 |  |  |  |  |  |  |
Securities Purchase Agreement Warrants [Member] |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ 5,000 |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ 600 |  |  |  |  |  |  |
The 2020 Shelf [Member] |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  |  | $ 100,000
At-the-market Offering [Member] |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  | $ 30,000 |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 699,929 |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  | $ 2,900 |  |  |
The 2021 Shelf [Member] |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  | $ 100,000 |  |
Sale of Stock, Remaining Amount Available |  |  | $ 82,400 |  |  |  |  |
The August 2022 Offering [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,075,290 |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 10,000 |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) |  | $ 8.6 |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs |  | $ 900 |  |  |  |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,743,695 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 4,000 |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs | 3,400 |  |  |  |  |  |  |
Class of Warrant or Right, Covenant, Adjusted EBITDA | $ 12,000 |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  |  | 40,017 |  |  |  |  |

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