Note 6 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Marketable securities	$ 97,703	$ 112,080
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	29,099	17,552
Available-for-sale - matures within one year, Gross unrealized gains	0	0
Available-for-sale - matures within one year, Gross unrealized losses	(1,616)	(1,330)
Available-for-sale - matures within one year, Fair value	27,483	16,222
Available-for-sale - matures after one year through five years, Amortized cost	74,640	101,355
Available-for-sale - matures after one year through five years, Gross unrealized gains	3	38
Available-for-sale - matures after one year through five years, Gross unrealized losses	(4,423)	(5,535)
Available-for-sale - matures after one year through five years, Fair value	70,220	95,858
Debt Securities, Available-for-Sale, Amortized Cost	103,739	118,907
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	3	38
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(6,039)	(6,865)
Marketable securities	$ 97,703	$ 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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