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Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets, fair value | $ 47,417 |
Fair Value, Recurring [Member] |  |
Assets, fair value | 47,417 | $ 23,088
Fair Value, Recurring [Member] | Money Market Securities [Member] |  |
Assets, fair value | 5,081 | 1,515
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Assets, fair value | 22,222 | 14,622
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Assets, fair value | 14,362 | 5,953
Fair Value, Recurring [Member] | Federal Agency Notes [Member] |  |
Assets, fair value | 5,752 | 998
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 5,081 | 1,515
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Securities [Member] |  |
Assets, fair value | 5,081 | 1,515
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] | US Treasury Securities [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 2 [Member] |  |
Assets, fair value | 42,336 | 21,573
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 | 22,222 | 14,622
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Assets, fair value | 14,362 | 5,953
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Federal Agency Notes [Member] |  |
Assets, fair value | 5,752 | 998
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] | US Treasury Securities [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

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