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Note 7 - Equity (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2025 USD ($) $ / shares shares | Mar. 19, 2025 USD ($) $ / shares shares | Dec. 02, 2024 USD ($) $ / shares shares | Dec. 02, 2024 USD ($) $ / shares | Nov. 29, 2024 USD ($) $ / shares shares | May 13, 2024 USD ($) $ / shares shares | Apr. 11, 2024 shares | Dec. 31, 2024 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) | Oct. 01, 2024 shares | Apr. 10, 2024 shares
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  |  |  | 20,022,836 | 24,268,739 |  |  |
Treasury Stock, Common, Shares (in shares) |  |  |  |  |  |  |  | 768,595 | 768,595 |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  |  |  | 20,791,431 | 25,037,334 |  |  |
Stock Issued During Period, Pre-Funded Warrants Exercised, Shares (in shares) |  |  |  |  |  |  |  |  | 3,928,073 |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0005 | $ 0.0005 |  |  |
Proceeds from Issuance of Warrants | $ |  |  |  |  |  |  |  |  | $ 8,972 | $ 9,900 |  |
Treasury Stock, Common, Value | $ |  |  |  |  |  |  |  | $ 11,407 | $ 11,407 |  |  |
May 2024 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 2,955,084 |  |  |  |  |  |
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.384 |  |  |  |  |  |
Warrants Issued, Underwriting Discounts or Commissions Paid | $ |  |  |  |  |  | $ 0 |  |  |  |  |  |
Proceeds from Issuance of Warrants | $ |  |  |  |  |  | 10,000 |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ |  |  |  |  |  | $ 100 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.0005 |  |  |  |  |  |
December 2024 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 1,187,802 |  |  |  |  |  |  |
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares |  |  |  |  | $ 2.3147 |  |  |  |  |  |  |
Warrants Issued, Underwriting Discounts or Commissions Paid | $ |  |  |  |  | $ 0 |  |  |  |  |  |  |
Proceeds from Issuance of Warrants | $ |  |  |  | $ 2,750 |  |  |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ |  |  | $ 22 | $ 22 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 0.0005 |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  | 647,892 |  |  |  |
March Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 0.0005 |  |  |  |  |  |  |  |  |  |
May 2025 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,829,956 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares | $ 2.1995 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.0005 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ | $ 2,671 |  |  |  |  |  |  |  |  |  |  |
May 2025 Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,829,956 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 2.2 |  |  |  |  |  |  |  | $ 2.2 |  |  |
Warrants and Rights Outstanding, Term (Year) | 3 years |  |  |  |  |  |  |  | 3 years |  |  |
Proceeds from Issuance of Private Placement | $ | $ 1,354 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  |  |  | 0 | 1,829,956 |  |  |
May 2025 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued, Underwriting Discounts or Commissions Paid | $ | 0 |  |  |  |  |  |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ | 54 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ | $ 4,025 |  |  |  |  |  |  |  |  |  |  |
December 2024, March 2025, And May 2025 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  | 3,928,073 |  |  |
Direct Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 2,483,586 |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 0.0005 | $ 0.0005 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ |  |  | $ 5,750 |  |  |  |  |  |  |  |  |
Stock Issuance, Offering Costs Payable | $ |  |  | $ 562 | $ 562 |  |  |  |  |  |  |  |
Registered Direct Offering Through Agent [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 1,943,676 |  |  |  |  |  |  |  |  |
Stock Issued, Cash Fee, Percentage of Gross Proceeds Raised |  |  | 4.00% |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  | $ 4,500 |  |  |  |  |  |  |  |  |
March Purchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement, Number of Shares (in shares) |  | 2,332,104 |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Unit (in dollars per share) | $ / shares |  | $ 2.174 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  | $ 5,070 |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  | $ 70 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  |  |  |  |  |  |  |  | 317,830 |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  |  | 6 |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  |  | 13,660,598 |  |  |  |  | 81,571,864
Treasury Stock, Common, Shares (in shares) |  |  |  |  |  |  | 768,595 |  |  |  | 4,611,569 |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  |  | 13,660,598 |  |  |  |  | 81,571,864

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