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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2025 | Jul. 03, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025 | Mar. 31, 2026 | Dec. 31, 2024 | Mar. 28, 2024
Preferred Stock, Shares Authorized (in shares) |  |  | 50,000,000 |  | 50,000,000 | 50,000,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 0 |  | 0 | 0 |  |
Common Stock, Shares Authorized (in shares) |  |  | 500,000,000 |  | 500,000,000 | 500,000,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Equity Offering, Units, Maximum Amount Authorized (in shares) |  | 6,000,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 11 |  | $ 11 | $ 11 |  |
Class of Warrant or Right, Expired/Redeemed During Period (in shares) |  |  | (0) |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 386,963 |  | 405,624 | 386,963 |  |
Proceeds from Warrant Exercises |  |  | $ 130 | $ 14,075 | $ 14,100 | $ 63,700 |  |
Warrants Issued in 2024 Rights Offering [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 5,999,999 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 11 |  |  |  |  |  |
Class of Warrans or Right, Exercise Price, Percentage of Subscription Price for Units |  | 110.00% |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |
Warrants Issued in 2024 Rights Offering [Member] | Vesting of First Half [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 18,221 |  |  |  |  |  |  |
Class of Warrants or Rights, Redemption Price Per Share (in dollars per share) |  | $ 0.01 |  |  |  |  |  |
Class of Warrant or Right, Percentage Required for Redemption | 150.00% | 150.00% | 150.00% |  |  | 150.00% |  |
Class of Warrant or Right, Vesting, Stock Price Trigger (in dollars per share) |  | $ 16.5 |  |  |  |  | $ 18.85 |
Class of Warrant or Right, Expired/Redeemed During Period (in shares) | 36,442 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 0 |  | 0 |  |  | 0 |  |
Warrants Issued in 2024 Rights Offering [Member] | Vesting of Second Half [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 193,481 |  |  | 193,481 |  |
Class of Warrants or Rights, Redemption Price Per Share (in dollars per share) | $ 0.01 |  |  |  |  |  |  |
Class of Warrant or Right, Percentage Required for Redemption | 200.00% |  | 200.00% |  |  | 200.00% |  |
Class of Warrant or Right, Vesting, Stock Price Trigger (in dollars per share) | $ 22 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 386,963 |  |  | 386,963 |  |
The 2024 Right Offering [Member] |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | 0.001 |  |  |  |  |  |
Equity Offering, Units, Maximum Amount Authorized (in shares) |  |  |  |  |  |  |  | 6,000,000
Equity Offering Units, Offering Value |  |  |  |  |  |  |  | $ 60,000
Shares Issued, Price Per Share (in dollars per share) |  | $ 10 |  |  |  |  |  |
Number of Shares Per Unit Issued (in shares) |  | 1 |  |  |  |  |  |
Number of Warrants in Each Unit (in shares) |  | 2 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 5,999,998 |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 60,000 |  |  |  |  |  |
The 2024 Right Offering [Member] | Majority Stockholder and Co-chairman [Member] |  |  |  |  |  |  |  |
Percent of Offering Purchased |  | 88.00% |  |  |  |  |  |
The 2024 Right Offering [Member] | Warrants Issued in 2024 Rights Offering [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 0.5 |  |  |  |  |  |
The 2024 Right Offering [Member] | Warrants Issued in 2024 Rights Offering [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 6,000,000 |  |  |  |  |  |

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