Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Marketable securities	$ 106,142	$ 112,080
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	23,397	17,552
Available-for-sale - matures within one year, Gross unrealized gains	0	0
Available-for-sale - matures within one year, Gross unrealized losses	(1,517)	(1,330)
Available-for-sale - matures within one year, Fair value	21,880	16,222
Available-for-sale - matures after one year through five years, Amortized cost	88,934	101,355
Available-for-sale - matures after one year through five years, Gross unrealized gains	25	38
Available-for-sale - matures after one year through five years, Gross unrealized losses	(4,697)	(5,535)
Available-for-sale - matures after one year through five years, Fair value	84,262	95,858
Debt Securities, Available-for-Sale, Amortized Cost	112,331	118,907
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	25	38
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(6,214)	(6,865)
Marketable securities	$ 106,142	$ 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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-Name Accounting Standards Codification
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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).

+ References

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

+ References

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