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Note 4 - Investments and Fair-value Measurements - Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt securities, available for sale, amortized cost	$ 121,636	$ 164,743
Debt securities, available for sale, gross unrealized gains (losses)	4	19
Debt securities, available for sale, fair value	121,640	164,762
Debt securities, amortized cost	122,690	165,797
Debt securities, fair value	122,694	165,816
US Treasury Securities [Member]
Debt securities, available for sale, amortized cost	19,924	102,100
Debt securities, available for sale, gross unrealized gains (losses)	4	19
Debt securities, available for sale, fair value	19,928	102,119
Money Market Funds [Member]
Debt securities, available for sale, amortized cost	101,712	62,643
Debt securities, available for sale, gross unrealized gains (losses)	0	0
Debt securities, available for sale, fair value	101,712	62,643
Certificates of Deposit [Member]
Debt securities, held-to-maturity, amortized cost	1,054	1,054
Debt securities, held-to-maturity, fair value	$ 1,054	$ 1,054

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-2

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Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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+ References

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