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Note 5 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Adjusted cost | [1] | $ 56,849 | $ 66,580
Gross unrealized losses | [1] | (16) | (18)
Fair value | [1] | 56,833 | 66,562
Fair value | [1] | (56,833) | (66,562)
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Adjusted cost | [1] | 2,143 | 20,711
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 2,143 | 20,711
Fair value | [1] | (2,143) | (20,711)
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 6,759 | 14,006
Gross unrealized losses | [1] | 0 | (2)
Fair value | [1] | 6,759 | 14,004
Fair value | [1] | (6,759) | (14,004)
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Adjusted cost | [1] | 47,947 | 31,863
Gross unrealized losses | [1] | (16) | (16)
Fair value | [1] | 47,931 | 31,847
Fair value | [1] | $ (47,931) | $ (31,847)
[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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