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Note 7 - Stockholders' Equity and Stock-based Compensation (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
May 05, 2022 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 05, 2025
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 | $ 0.001 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 225,209 |  |  |
Proceeds from Stock Options Exercised |  | $ 90,000 | $ 918,000 | $ 2,560,000 |
Share-Based Payment Arrangement, Expense |  | 19,582,000 | 16,291,000 | 4,586,000 |
Employee Severance [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 0 | $ 600,000 | $ 0 |
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) |  | 225,209 |  |  |
Stock Options Exercised Net Settled Satisfaction Of Exercise Price (in shares) |  | 120,492 |  |  |
Proceeds from Stock Options Exercised |  | $ 0 |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  | 0.00% | 0.00% | 0.00% |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 24,500,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 4 months 24 days |  |  |
Performance Shares [Member] |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 101,000 |  |  |
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 |  |  |  |
At-the-market 2025 Offering Program [Member] |  |  |  |  |
Equity Offering, Maximum Amount |  |  |  |  | $ 50,000,000
Equity Offering, Percentage of Commission |  |  |  |  | 3.00%
Stock Issued During Period, Shares, New Issues (in shares) |  | 0 |  |  |

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