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Note 10 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 18, 2024 | Jul. 15, 2021 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Oct. 31, 2012 | Oct. 31, 2011
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  |  | 55,882 | 64,118 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  | 1,222,558 | 1,356,443 |  |  |
Common Stock, Shares Authorized (in shares) |  |  |  | 100,000,000 |  | 100,000,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 |  |
Ordinary Shares Ownership Percentage |  |  |  |  |  |  |  | 20.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 1.95 | $ 4.57 |  |  |
Non-vested Stock Options [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  | $ 0.7 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 1 year 1 month 6 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  | 1,222,558 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  | $ 3.8 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 3 months 18 days |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 3.34 | $ 5.89 |  |  |
Equity Incentive Plan Twenty Eleven [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | 3,000,000 |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  | 17,529,412 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  |  |  | 4,518,398 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 3,310,878 |  |  |  |
Employment Inducement Incentive Award Plan Twenty Seventeen [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) |  | 1,000,000 |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  | 3,000,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) |  |  |  | 393,800 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 1,328,505 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  |
Employment Inducement Incentive Award Plan Twenty Seventeen [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Options Initial Contractual Term (Year) |  |  |  | 10 years |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 2,116,250 |  |  | 2,116,250 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 16 |  |  | $ 16 |

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