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Note 4 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Adjusted cost | [1] | $ 16,437 | $ 22,987
Gross unrealized gain losses | [1] | (17) | (10)
Fair value | [1] | 16,420 | 22,977
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Adjusted cost | [1] | 2,852 | 581
Gross unrealized gain losses | [1] | 0 | 0
Fair value | [1] | 2,852 | 581
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Adjusted cost | [1] | 1,932 | 4,893
Gross unrealized gain losses | [1] | 0 | (1)
Fair value | [1] | 1,932 | 4,892
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Adjusted cost | [1] | 11,653 | 17,513
Gross unrealized gain losses | [1] | (17) | (9)
Fair value | [1] | $ 11,636 | $ 17,504
[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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