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Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets, fair value | $ 11,202 |
Fair Value, Recurring [Member] |  |
Assets, fair value | 11,202 | $ 25,254
Fair Value, Recurring [Member] | Money Market Securities [Member] |  |
Assets, fair value | 1,604 | 112
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Assets, fair value | 4,390 | 10,633
Fair Value, Recurring [Member] | Federal Agency Notes [Member] |  |
Assets, fair value | 3,212 | 5,317
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Assets, fair value | 1,996 | 9,192
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 1,604 | 112
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Securities [Member] |  |
Assets, fair value | 1,604 | 112
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Federal Agency Notes [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 9,598 | 25,142
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Securities [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Assets, fair value | 4,390 | 10,633
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Federal Agency Notes [Member] |  |
Assets, fair value | 3,212 | 5,317
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Assets, fair value | 1,996 | 9,192
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Securities [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Federal Agency Notes [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Assets, fair value | $ 0 | $ 0

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