Note 6 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Marketable securities	$ 137,481	$ 143,117
Corporate Bonds [Member]
Available For Sale Securities Debt Maturities Within One Year Amortized Cost	39,596	61,113
Available-for-sale - matures within one year, Gross unrealized gains	51	41
Available-for-sale - matures within one year, Gross unrealized losses	(310)	(146)
Available-for-sale- matures within one year, Fair Value	39,337	61,008
Available-for-sale - matures after one year through five years, amortized cost	98,714	83,491
Available-for-sale - matures after one year through five years, Gross unrealized gains	335	221
Available for Sale Matures after One Year Through Five Years, Gross Unrealized Loss	(905)	(1,603)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value	98,144	82,109
Debt Securities, Available-for-Sale, Amortized Cost	138,310	144,604
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	386	262
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(1,215)	(1,749)
Marketable securities	$ 137,481	$ 143,117

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
-SubTopic 10
-Name Accounting Standards Codification
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-Publisher FASB
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Publisher FASB
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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
-Topic 944
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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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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 fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

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