Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Marketable securities	$ 132,695	$ 112,080
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	27,690	17,552
Available-for-sale - matures within one year, Gross unrealized gains	4	0
Available-for-sale - matures within one year, Gross unrealized losses	(243)	(1,330)
Available-for-sale - matures within one year, Fair value	27,451	16,222
Available-for-sale - matures after one year through five years, Amortized cost	108,700	101,355
Available-for-sale - matures after one year through five years, Gross unrealized gains	278	38
Available-for-sale - matures after one year through five years, Gross unrealized losses	(3,734)	(5,535)
Available-for-sale - matures after one year through five years, Fair value	105,244	95,858
Available-for-sale, Amortized cost	136,390	118,907
Total	282	38
Total	(3,977)	(6,865)
Marketable securities	$ 132,695	$ 112,080

Available for sale matures after one year through five years gross unrealized gains.

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Available for sale matures after one year through five years gross unrealized loss.

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Available for sale matures within one year, gross unrealized gains.

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Amount, before tax, of unrealized gain 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).

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Amount, before tax, of unrealized 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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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