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Note 4 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Adjusted cost | [1] | $ 27,076 | $ 36,041
Gross unrealized gain losses | [1] | (18) | (26)
Fair value | [1] | 27,058 | 36,015
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Adjusted cost | [1] | 1,951 | 2,092
Gross unrealized gain losses | [1] | 0 | 0
Fair value | [1] | 1,951 | 2,092
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Adjusted cost | [1] | 6,797 | 3,458
Gross unrealized gain losses | [1] | (1) | 0
Fair value | [1] | 6,796 | 3,458
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Adjusted cost | [1] | 18,328 | 30,491
Gross unrealized gain losses | [1] | (17) | (26)
Fair value | [1] | $ 18,311 | $ 30,465
[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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