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Note 4 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Adjusted cost | [1] | $ 66,537 | $ 68,401
Gross unrealized losses | [1] | (2) | (11)
Fair value | [1] | 66,535 | 68,390
Fair value | [1] | (66,535) | (68,390)
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Adjusted cost | [1] | 42,735 | 21,042
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 42,735 | 21,042
Fair value | [1] | (42,735) | (21,042)
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 0 | 5,458
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 0 | 5,458
Fair value | [1] | 0 | (5,458)
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 22,993 | 30,280
Gross unrealized losses | [1] | (2) | (5)
Fair value | [1] | 22,991 | 30,275
Fair value | [1] | (22,991) | (30,275)
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 809 | 11,621
Gross unrealized losses | [1] | 0 | (6)
Fair value | [1] | 809 | 11,615
Fair value | [1] | $ (809) | $ (11,615)
[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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