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Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 05, 2022 | May 08, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | May 01, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) |  |  | $ 22.95 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  | 2 years 2 months 12 days |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  | $ 31,800,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  | 225,209 |  |  |
Proceeds from Stock Options Exercised |  |  | $ 90,000 | $ 0 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 0 |  |  |
Share-based Compensation Expense, Estimated Forfeitures |  |  | $ 800,000 | $ 0 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 |
The 2018 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 5,000,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  | 1,300,000 |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 1.44 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |
Subsequent Event [Member] | Vesting Each Year [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  | 25.00% |  |  |  |
Subsequent Event [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 1 year |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  | 25.00% |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 100,000 |  |  |
Stock Options Net Settled in Satisfaction of the Exercise Price [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  | 120,492 |  |  |
Proceeds from Stock Options Exercised |  |  | $ 0 |  |  |
At-the-market Common Stock Offering [Member] |  |  |  |  |  |
Equity Offering, Maximum Amount |  |  |  |  |  | $ 200,000,000
Equity Offering, Percentage of Commission |  |  |  |  |  | 3.00%
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 0 | 0 |  |

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