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Note 8 - Fair Value Measurements - Summary of Cash Equivalents and Short-term Investments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 50,196 | $ 27,448
Total cash equivalents and available-for-sale securities | 270,900 |
Fair Value, Recurring [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 50,196 | 27,448
Available-for-sale securities | 216,957 | 114,108
Total cash equivalents and available-for-sale securities | 267,153 | 141,556
Fair Value, Recurring [Member] | Money Market Fund [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 49,158 | 24,134
Fair Value, Recurring [Member] | Securities of U.S. Government and Government Agencies [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 72,099 | 30,010
Fair Value, Recurring [Member] | Commercial Paper [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents |  | 2,488
Available-for-sale securities | 43,977 | 19,499
Fair Value, Recurring [Member] | Certificates of Deposit [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities |  | 1,721
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,038 | 826
Available-for-sale securities | 96,229 | 56,960
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] | Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 4,652 | 5,918
Level 1 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 49,158 | 24,134
Total cash equivalents and available-for-sale securities | 49,158 | 24,134
Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Fund [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 49,158 | 24,134
Level 2 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,038 | 3,314
Available-for-sale securities | 216,957 | 114,108
Total cash equivalents and available-for-sale securities | 217,995 | 117,422
Level 2 [Member] | Fair Value, Recurring [Member] | Securities of U.S. Government and Government Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 72,099 | 30,010
Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents |  | 2,488
Available-for-sale securities | 43,977 | 19,499
Level 2 [Member] | Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities |  | 1,721
Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,038 | 826
Available-for-sale securities | 96,229 | 56,960
Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | $ 4,652 | $ 5,918

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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