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Note 4 - Fair Value Measurements - Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Adjusted cost | [1] | $ 58,622 | $ 66,580
Gross unrealized losses | [1] | (39) | (18)
Fair value | [1] | 58,583 | 66,562
Fair value | [1] | (58,583) | (66,562)
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Adjusted cost | [1] | 10,956 | 20,711
Gross unrealized losses | [1] | 0 | 0
Fair value | [1] | 10,956 | 20,711
Fair value | [1] | (10,956) | (20,711)
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Adjusted cost | [1] | 10,658 | 14,006
Gross unrealized losses | [1] | (2) | (2)
Fair value | [1] | 10,656 | 14,004
Fair value | [1] | (10,656) | (14,004)
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Adjusted cost | [1] | 37,008 | 31,863
Gross unrealized losses | [1] | (37) | (16)
Fair value | [1] | 36,971 | 31,847
Fair value | [1] | $ (36,971) | $ (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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