Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Fair Value Measurements - Investments (Details)

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Note 4 - Fair Value Measurements - Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Adjusted cost [1] $ 48,871 $ 56,849
Gross unrealized gain losses [1] (7) (16)
Fair value [1] 48,864 56,833
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Adjusted cost [1] 19,102 2,143
Gross unrealized gain losses [1] 0 0
Fair value [1] 19,102 2,143
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]    
Adjusted cost [1] 5,625 6,759
Gross unrealized gain losses [1] 0 0
Fair value [1] 5,625 6,759
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]    
Adjusted cost [1] 24,144 47,947
Gross unrealized gain losses [1] (7) (16)
Fair value [1] $ 24,137 $ 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.