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Note 4 - Fair-Value Measurements - Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt securities, available for sale, amortized cost	$ 164,743	$ 183,909
Debt securities, available for sale, gross unrealized gains (losses)	19	22
Debt securities, available for sale, fair value	164,762	183,931
Debt securities, amortized cost	165,797	184,963
Debt securities, fair value	165,816	184,985
US Treasury Securities [Member]
Debt securities, available for sale, amortized cost	102,100	99,027
Debt securities, available for sale, gross unrealized gains (losses)	19	22
Debt securities, available for sale, fair value	102,119	99,049
Money Market Funds [Member]
Debt securities, available for sale, amortized cost	62,643	84,882
Debt securities, available for sale, gross unrealized gains (losses)	0	0
Debt securities, available for sale, fair value	62,643	84,882
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

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-Topic 320
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