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Note 3 - Fair Value Measurements - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Adjusted Cost $ 26,416 $ 31,659
Unrealized Gains 0 0
Unrealized Losses (17) (6)
Market Value 26,399 31,653
Money Market Fund [Member]    
Adjusted Cost 1,537 1,670
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 1,537 1,670
US Treasury Securities in Short-term Investments [Member]    
Adjusted Cost 24,879 29,989
Unrealized Gains 0 0
Unrealized Losses (17) (6)
Market Value $ 24,862 $ 29,983