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Note 6 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Marketable securities | $ 30,306 |
Corporate Debt Securities [Member] |  |
Marketable securities | 3,549 |
US Government Agencies Debt Securities [Member] |  |
Marketable securities | 24,805 |
Certificates of Deposit [Member] |  |
Marketable securities | 517 |
Money Market Funds [Member] |  |
Cash equivalents, fair value | 4 |
Cash equivalents, fair value | 4 |
Fair Value, Recurring [Member] |  |
Marketable securities | 30,306 | $ 9,711
Total assets at fair value | 39,749 | 49,329
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Cash equivalents, fair value | 9,439 |
Cash equivalents, fair value | 9,439 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Marketable securities | 3,549 | 6,058
Fair Value, Recurring [Member] | Cash and Cash Equivalents 1 [Member] |  |
Cash equivalents, fair value | 9,443 |
Cash equivalents, fair value | 9,443 |
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Cash equivalents, fair value | 1,435 |
Marketable securities |  | 1,695
Cash equivalents, fair value | 1,435 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Marketable securities | 24,805 |
Fair Value, Recurring [Member] | Certificates of Deposit [Member] |  |
Marketable securities | 517 | 1,958
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Marketable securities | 24,805 | 0
Total assets at fair value | 34,248 | 39,618
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Cash equivalents, fair value | 9,439 |
Cash equivalents, fair value | 9,439 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Marketable securities | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents 1 [Member] |  |
Cash equivalents, fair value | 9,443 |
Cash equivalents, fair value | 9,443 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Cash equivalents, fair value | 0 |
Marketable securities |  | 0
Cash equivalents, fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Marketable securities | 24,805 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |
Marketable securities | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Marketable securities | 5,501 | 9,711
Total assets at fair value | 5,501 | 9,711
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Cash equivalents, fair value | 0 |
Cash equivalents, fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Marketable securities | 3,549 | 6,058
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents 1 [Member] |  |
Cash equivalents, fair value | 0 |
Cash equivalents, fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Cash equivalents, fair value | 1,435 |
Marketable securities |  | 1,695
Cash equivalents, fair value | 1,435 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Marketable securities | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Marketable securities | 517 | 1,958
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Cash equivalents, fair value | 4 | 39,618
Cash equivalents, fair value | 4 | 39,618
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents, fair value | 4 | 39,618
Cash equivalents, fair value | 4 | 39,618
Fair Value, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents, fair value | 0 | 0
Cash equivalents, fair value | $ 0 | $ 0

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