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Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 05, 2022 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) |  | $ 15.23 |  | $ 15.23 | $ 15.23 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  | 2 years 6 months |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | $ 28,900,000 |  | $ 28,900,000 | $ 28,900,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 225,209 |  |  |  |  |
Stock Options Exercised Net Settled Satisfaction Of Exercise Price (in shares) |  |  |  |  | 120,492 |  |
Proceeds from Stock Options Exercised |  |  |  |  | $ 90,000 | $ 0 |
Share-based Compensation Expense, Estimated Forfeitures |  | $ 0 | $ 0 |  | $ 0 | $ 0 |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 |  | $ 0.001 | $ 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 |  |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | $ 100,000 |  | $ 100,000 | $ 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) |  |  |  | 0 | 225,209 |  |
Proceeds from Stock Options Exercised |  |  |  |  | $ 0 |  |

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