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
Mar. 31, 2022
Mar. 31, 2021
Adjusted cost [1] $ 64,359 $ 66,580
Gross unrealized losses [1] (41) (18)
Fair value [1] 64,318 66,562
Fair value [1] (64,318) (66,562)
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Adjusted cost [1] 5,385 20,711
Gross unrealized losses [1] 0 0
Fair value [1] 5,385 20,711
Fair value [1] (5,385) (20,711)
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 30,176 14,006
Gross unrealized losses [1] (17) (2)
Fair value [1] 30,159 14,004
Fair value [1] (30,159) (14,004)
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 28,798 31,863
Gross unrealized losses [1] (24) (16)
Fair value [1] 28,774 31,847
Fair value [1] $ (28,774) $ (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.