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Note 11 - Equity (Details Textual) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Jan. 01, 2026 shares | Dec. 31, 2025 USD ($) $ / shares shares | Aug. 19, 2025 USD ($) $ / shares shares | May 15, 2025 USD ($) $ / shares shares | Mar. 19, 2025 USD ($) $ / shares shares | Dec. 02, 2024 USD ($) $ / shares | Dec. 02, 2024 USD ($) $ / shares shares | Nov. 29, 2024 USD ($) $ / shares shares | May 13, 2024 USD ($) $ / shares shares | Apr. 11, 2024 shares | Sep. 30, 2025 shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Oct. 01, 2024 shares | Apr. 10, 2024 shares
Common Stock, Shares, Outstanding (in shares) |  | 29,636,184 |  |  |  |  |  |  |  |  |  | 20,022,836 | 29,636,184 | 20,022,836 |  |
Treasury Stock, Common, Shares (in shares) |  | 768,595 |  |  |  |  |  |  |  |  |  | 768,595 | 768,595 | 768,595 |  |
Common Stock, Shares, Issued (in shares) |  | 30,404,779 |  |  |  |  |  |  |  |  |  | 20,791,431 | 30,404,779 | 20,791,431 |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.0005 |  |  |  |  |  |  |  |  |  | $ 0.0005 | $ 0.0005 | $ 0.0005 |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,189,000 |  |
Proceeds from Issuance of Warrants | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,370,000 | 12,627,000 |  |
Treasury Stock, Common, Value | $ |  | $ 11,407,000 |  |  |  |  |  |  |  |  |  | $ 11,407,000 | $ 11,407,000 | $ 11,407,000 |  |
Preferred Stock, Shares Authorized (in shares) |  | 10,000,000 |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 | 10,000,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |
Preferred Stock, Shares Issued (in shares) |  | 0 |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Preferred Stock, Shares Outstanding (in shares) |  | 0 |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 485,276 | 316,333 |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Direct Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 2,483,586 |  |  |  |  |  | 3,542,856 | 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 | $ |  |  |  |  |  |  | $ 5,750,000 |  |  |  |  |  |  |  |  |
Stock Issuance, Offering Costs Payable | $ |  |  |  |  |  | $ 562,000 | $ 562,000 |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ (0) | $ 561,000 |  |
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 | $ |  |  |  |  |  |  | $ 4,500,000 |  |  |  |  |  |  |  |  |
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 | $ |  |  |  |  | $ 5,070,000 |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  | $ 70,000 |  |  |  |  |  |  |  |  |  |  |
August 2025 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 3,542,856 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  | $ 3,271,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  |  | $ 10,275,000 |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.0005 |  |  |  |  |  |  |  |  |  |  | $ 0.0005 |  |  |
Stock Issued During Period, Value, New Issues | $ |  | $ 11,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issuance, Commission Fee |  | 3.00% |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |
Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Warrants Exercise, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 5,585,216 | 3,602,976 |  |
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 | $ |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
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 | $ |  |  |  |  |  | 2,750,000 |  |  |  |  |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ |  |  |  |  |  | $ 22,000 | $ 22,000 |  |  |  |  |  |  |  |  |
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 | $ |  |  |  | $ 2,671,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ |  |  |  | $ 1,354,000 |  |  |  |  |  |  |  |  |  |  |  |
May 2025 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued, Underwriting Discounts or Commissions Paid | $ |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ |  |  |  | 54,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ |  |  |  | $ 4,025,000 |  |  |  |  |  |  |  |  |  |  |  |
August 2025 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Warrants Exercise, Shares (in shares) |  |  |  |  |  |  |  |  |  |  | 1,657,143 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 2,328,571 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares |  |  | $ 1.7495 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 0.0005 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  | $ 2,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Not Exercisable Until Approval (in shares) |  |  | 585,714 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2025 Pre-funded Warrants [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Warrants Exercise, Shares (in shares) | 85,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
August 2025 Common Stock Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 5,871,427 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares |  |  | $ 1.75 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued, Amount of Offering Expenses Payable | $ |  |  | $ 742,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 2.21 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  | $ 4,854,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership limits, Percentage, Maximum |  |  | 9.99 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2025 Common Stock Warrant [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership limits, Percentage |  |  | 4.99 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2025 Common Stock Warrant [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership limits, Percentage |  |  | 9.99 |  |  |  |  |  |  |  |  |  |  |  |  |
December 2024, March 2025, And May 2025 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 5,585,216 |  |  |
Common Stock Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 7,701,383 |  |  |  |  |  |  |  |  |  | 0 | 7,701,383 | 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 |

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