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Note 5 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Adjusted cost | [1] | $ 36,041 | $ 47,219
Gross unrealized gain losses | [1] | (26) | (12)
Fair value | [1] | 36,015 | 47,207
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Adjusted cost | [1] | 2,092 | 213
Gross unrealized gain losses | [1] | 0 | 0
Fair value | [1] | 2,092 | 213
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Adjusted cost |  | 3,458 | 1,426
Gross unrealized gain losses |  | 0 | 1
Fair value |  | 3,458 | 1,427
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Adjusted cost | [1] | 30,491 | 45,580
Gross unrealized gain losses | [1] | (26) | (13)
Fair value | [1] | $ 30,465 | $ 45,567
[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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