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Note 7 - Marketable Securities - Short-term and Long-term Held-to-Maturity Securities (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Amortized Cost | $ 93,445
Unrealized Gains | 393
Unrealized Losses | (23)
Fair Value | 93,815
Bank Time Deposits [Member] |
Amortized Cost | 5,395
Unrealized Gains | 93
Unrealized Losses | 0
Fair Value | 5,488
US States and Political Subdivisions Debt Securities [Member] |
Amortized Cost | 25,003
Unrealized Gains | 83
Unrealized Losses | (2)
Fair Value | 25,084
Corporate Debt Securities [Member] |
Amortized Cost | 42,048
Unrealized Gains | 211
Unrealized Losses | (11)
Fair Value | 42,248
US Government Agencies Debt Securities [Member] |
Amortized Cost | 18,500
Unrealized Gains | 6
Unrealized Losses | (10)
Fair Value | 18,496
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |
Amortized Cost | 2,499
Unrealized Gains | 0
Unrealized Losses | 0
Fair Value | $ 2,499

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- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
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