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Note 4 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Adjusted cost | [1] | $ 79,187 | $ 82,334
Gross unrealized losses | [1] | (1) | (19)
Fair value | [1] | 79,186 | 82,315
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Adjusted cost | [1] | 35,607 | 11,659
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 35,607 | 11,659
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 12,077 | 13,544
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 12,077 | 13,544
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 31,198 | 347
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 31,198 | 347
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 305 | 56,784
Gross unrealized losses | [1] | (1) | (19)
Fair value | [1] | $ 304 | $ 56,765
[1] | FASB Topic 820, Fair Value Measurements, establishes a fair value hierarchy that requires the use of observable market data, when available, and prioritizes the inputs to valuation techniques used to measure fair value in the following categories: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Unobservable inputs that are not corroborated by market data.

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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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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