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Note 2 - Fair Value of Financial Instruments - Summary of the Fair Value of Marketable Securities (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value | $ 268,810
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value | 84,913
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value | 26,285
Debt Securities, Available-for-sale | 380,008
Commercial Paper [Member] |
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value | 18,896
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value | 0
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value | 0
Debt Securities, Available-for-sale | 18,896
US Government Agencies Debt Securities [Member] |
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value | 216,999
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value | 37,528
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value | 0
Debt Securities, Available-for-sale | 254,527
Foreign Government Agencies [Member] |
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value | 0
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value | 1,019
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value | 0
Debt Securities, Available-for-sale | 1,019
Corporate Bond Securities [Member] |
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value | 28,964
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value | 38,407
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value | 19,332
Debt Securities, Available-for-sale | 86,703
Asset-backed Securities [Member] |
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value | 3,951
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value | 7,959
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value | 6,953
Debt Securities, Available-for-sale | $ 18,863

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- Definition Represents fair value of available-for-sale securities for debt maturities for next twelve months. + References No definition available. + Details
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- Definition Represents fair value of debt maturities for available-for-sale securities through year one to year two. + References No definition available. + Details
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- Definition Amount 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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