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Note 7 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) $ in Thousands | Mar. 31, 2021 USD ($)
--- | ---
Amortized Cost | $ 49,186
Unrealized Gains | 203
Unrealized Losses | (37)
Fair Value | 49,352
Bank Time Deposits [Member] |
Amortized Cost | 5,395
Unrealized Gains | 73
Unrealized Losses | 0
Fair Value | 5,468
US States and Political Subdivisions Debt Securities [Member] |
Amortized Cost | 19,281
Unrealized Gains | 51
Unrealized Losses | (5)
Fair Value | 19,327
Corporate Debt Securities [Member] |
Amortized Cost | 20,010
Unrealized Gains | 78
Unrealized Losses | (30)
Fair Value | 20,058
US Government Agencies Debt Securities [Member] |
Amortized Cost | 3,500
Unrealized Gains | 1
Unrealized Losses | (2)
Fair Value | 3,499
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |
Amortized Cost | 1,000
Unrealized Gains | 0
Unrealized Losses | 0
Fair Value | $ 1,000

X
- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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X
- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 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=121558606&loc=SL82898722-210454 + Details
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