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Note 4 - Investments and Fair-value Measurements - Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities, available for sale, amortized cost | $ 121,636 | $ 164,743
Debt securities, available for sale, gross unrealized gains (losses) | 4 | 19
Debt securities, available for sale, fair value | 121,640 | 164,762
Debt securities, amortized cost | 122,690 | 165,797
Debt securities, fair value | 122,694 | 165,816
US Treasury Securities [Member] |  |
Debt securities, available for sale, amortized cost | 19,924 | 102,100
Debt securities, available for sale, gross unrealized gains (losses) | 4 | 19
Debt securities, available for sale, fair value | 19,928 | 102,119
Money Market Funds [Member] |  |
Debt securities, available for sale, amortized cost | 101,712 | 62,643
Debt securities, available for sale, gross unrealized gains (losses) | 0 | 0
Debt securities, available for sale, fair value | 101,712 | 62,643
Certificates of Deposit [Member] |  |
Debt securities, held-to-maturity, amortized cost | 1,054 | 1,054
Debt securities, held-to-maturity, fair value | $ 1,054 | $ 1,054

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