Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Fair Value Measurements - Investments (Details)

v3.21.2
Note 4 - Fair Value Measurements - Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Adjusted cost [1] $ 66,537 $ 68,401
Gross unrealized losses [1] (2) (11)
Fair value [1] 66,535 68,390
Fair value [1] (66,535) (68,390)
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Adjusted cost [1] 42,735 21,042
Gross unrealized losses [1] 0 0
Fair value [1] 42,735 21,042
Fair value [1] (42,735) (21,042)
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 0 5,458
Gross unrealized losses [1] 0 0
Fair value [1] 0 5,458
Fair value [1] 0 (5,458)
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 22,993 30,280
Gross unrealized losses [1] (2) (5)
Fair value [1] 22,991 30,275
Fair value [1] (22,991) (30,275)
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 809 11,621
Gross unrealized losses [1] 0 (6)
Fair value [1] 809 11,615
Fair value [1] $ (809) $ (11,615)
[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.