Annual report pursuant to Section 13 and 15(d)

Note 5 - Fair Value Measurements - Investments (Details)

v3.20.4
Note 5 - Fair Value Measurements - Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Adjusted cost [1] $ 68,401 $ 82,334
Gross unrealized losses [1] (11) (19)
Fair value [1] 68,390 82,315
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Adjusted cost [1] 21,042 11,659
Gross unrealized losses [1] 0 0
Fair value [1] 21,042 11,659
Bank Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 5,458 13,544
Gross unrealized losses [1] 0 0
Fair value [1] 5,458 13,544
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 30,280 347
Gross unrealized losses [1] (5) 0
Fair value [1] 30,275 347
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted cost [1] 11,621 56,784
Gross unrealized losses [1] (6) (19)
Fair value [1] $ 11,615 $ 56,765
[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.