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Note 2 - Fair Value of Financial Instruments - Summary of the Fair Value of Marketable Securities (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	$ 299,801
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	50,919
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	31,441
Debt Securities, Available-for-sale	382,161
Commercial Paper [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	23,541
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	23,541
Corporate Bond Securities [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	43,595
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	28,355
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	14,157
Debt Securities, Available-for-sale	86,107
Asset-Backed Securities [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	3,708
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	6,584
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	11,807
Debt Securities, Available-for-sale	22,099
US Government Agencies Debt Securities [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	227,955
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	15,980
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	5,477
Debt Securities, Available-for-sale	249,412
Foreign Government Agencies [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	1,002
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	$ 1,002

X

- Definition

Represents fair value of available-for-sale for debt maturities after year two.

+ References

No definition available.

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X

- Definition

Represents fair value of available-for-sale securities for debt maturities for next twelve months.

+ References

No definition available.

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X

- 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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X

- 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 https://asc.fasb.org/extlink&oid=126897435&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 https://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 https://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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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