Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Marketable securities	$ 102,972	$ 90,298
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	8,756	11,937
Available-for-sale - matures within one year, Gross unrealized gains	2	39
Available-for-sale - matures within one year, Gross unrealized losses	(23)	(7)
Available-for-sale - matures within one year, Fair value	8,735	11,969
Available-for-sale - matures after one year through five years, Amortized cost	99,386	78,920
Available-for-sale - matures after one year through five years, Gross unrealized gains	0	227
Available-for-sale - matures after one year through five years, Gross unrealized losses	(5,149)	(818)
Available-for-sale - matures after one year through five years, Fair value	94,237	78,329
Available-for-sale, Amortized cost	108,142	90,857
Available-for-sale, Gross unrealized gains	2	266
Available-for-sale, Gross unrealized losses	(5,172)	(825)
Marketable securities	$ 102,972	$ 90,298

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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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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