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Note 6 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Corporate bonds	$ 83,884,000	$ 88,754,000
Corporate Bonds [Member]
Corporate bonds	83,884,000	88,754
Foreign exchange contracts	28,000
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Corporate bonds	0	0
Foreign exchange contracts	0
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Corporate bonds	83,884,000	88,754
Foreign exchange contracts	28,000
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Corporate bonds	0	$ 0
Foreign exchange contracts	$ 0

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), classified as current.

+ References

Reference 1: 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=121558606&loc=SL82898722-210454

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26626-111562

+ Details

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X

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

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