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Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets, fair value	$ 39,548
Fair Value, Recurring [Member]
Assets, fair value	39,548	$ 23,088
Fair Value, Recurring [Member] | Money Market Securities [Member]
Assets, fair value	2,822	1,515
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Assets, fair value	18,389	14,622
Fair Value, Recurring [Member] | Federal Agency Notes [Member]
Assets, fair value	12,904	998
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Assets, fair value	5,433	5,953
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	2,822	1,515
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Securities [Member]
Assets, fair value	2,822	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] | 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	36,726	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	18,389	14,622
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Federal Agency Notes [Member]
Assets, fair value	12,904	998
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Assets, fair value	5,433	5,953
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

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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