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Note 7 - Available-for-Sale Securities - Summary of Company's Available-for-sale Securities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 217,183 | $ 114,000
Available-for-Sale Securities, Unrealized Gains | 15 | 112
Available-for-Sale Securities, Unrealized Losses | (241) | (4)
Available-for-Sale Securities, Estimated Fair Value | $ 216,957 | $ 114,108
Securities of U.S. Government and Government Agencies [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale Securities , Maturities | Within two years | Within one year
Available-for-Sale Securities, Amortized Cost | $ 72,144 | $ 29,973
Available-for-Sale Securities, Unrealized Gains | 4 | 37
Available-for-Sale Securities, Unrealized Losses | (49) | 0
Available-for-Sale Securities, Estimated Fair Value | $ 72,099 | $ 30,010
Commercial Paper [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale Securities , Maturities | Within one year | Within one year
Available-for-Sale Securities, Amortized Cost | $ 44,060 | $ 19,484
Available-for-Sale Securities, Unrealized Gains | 1 | 15
Available-for-Sale Securities, Unrealized Losses | (84) | 0
Available-for-Sale Securities, Estimated Fair Value | $ 43,977 | $ 19,499
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale Securities , Maturities |  | Within one year
Available-for-Sale Securities, Amortized Cost |  | $ 1,720
Available-for-Sale Securities, Unrealized Gains |  | 1
Available-for-Sale Securities, Unrealized Losses |  | 0
Available-for-Sale Securities, Estimated Fair Value |  | $ 1,721
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale Securities , Maturities | Within one year | Within one year
Available-for-Sale Securities, Amortized Cost | $ 96,326 | $ 56,909
Available-for-Sale Securities, Unrealized Gains | 4 | 52
Available-for-Sale Securities, Unrealized Losses | (101) | (1)
Available-for-Sale Securities, Estimated Fair Value | $ 96,229 | $ 56,960
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available-for-Sale Securities , Maturities | Within three years | Within four years
Available-for-Sale Securities, Amortized Cost | $ 4,653 | $ 5,914
Available-for-Sale Securities, Unrealized Gains | 6 | 7
Available-for-Sale Securities, Unrealized Losses | (7) | (3)
Available-for-Sale Securities, Estimated Fair Value | $ 4,652 | $ 5,918

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