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Note 4 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Adjusted cost | [1] | $ 50,510 | $ 56,849
Gross unrealized gain losses | [1] | (8) | (16)
Fair value | [1] | 50,502 | 56,833
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Adjusted cost | [1] | 994 | 2,143
Gross unrealized gain losses | [1] | 0 | 0
Fair value | [1] | 994 | 2,143
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Adjusted cost | [1] | 28,343 | 6,759
Gross unrealized gain losses | [1] | 2 | 0
Fair value | [1] | 28,345 | 6,759
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Adjusted cost | [1] | 21,173 | 47,947
Gross unrealized gain losses | [1] | (10) | (16)
Fair value | [1] | $ 21,163 | $ 47,931
[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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