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Note 8 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost | $ 56,411 |
Unrealized Gains | 2 |
Unrealized Losses | (966) |
Fair Value | 55,447 |
Amortized Cost |  | $ 26,039
Unrealized Gains |  | 7
Unrealized Losses |  | (126)
Fair Value |  | 25,920
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 17,893 |
Unrealized Gains | 0 |
Unrealized Losses | (365) |
Fair Value | 17,528 |
Amortized Cost |  | 12,549
Unrealized Gains |  | 0
Unrealized Losses |  | (70)
Fair Value |  | 12,479
Corporate Debt Securities [Member] |  |
Amortized Cost | 12,299 |
Unrealized Gains | 0 |
Unrealized Losses | (234) |
Fair Value | 12,065 |
Amortized Cost |  | 9,303
Unrealized Gains |  | 0
Unrealized Losses |  | (44)
Fair Value |  | 9,259
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 22,284 |
Unrealized Gains | 2 |
Unrealized Losses | (355) |
Fair Value | 21,931 |
Amortized Cost |  | 2,500
Unrealized Gains |  | 0
Unrealized Losses |  | (12)
Fair Value |  | 2,488
Bank Time Deposits [Member] |  |
Amortized Cost | 941 |
Unrealized Gains | 0 |
Unrealized Losses | (6) |
Fair Value | 935 |
Amortized Cost |  | 1,687
Unrealized Gains |  | 7
Unrealized Losses |  | 0
Fair Value |  | 1,694
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Amortized Cost | 2,994 |
Unrealized Gains | 0 |
Unrealized Losses | (6) |
Fair Value | $ 2,988 |
Amortized Cost |  | 0
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Fair Value |  | $ 0

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