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Note 3 - Financial Instruments - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Adjusted Cost $ 3,906 $ 9,293
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 3,906 9,293
Money Market Funds [Member]    
Adjusted Cost 1,406 1,793
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 1,406 1,793
Certificates of Deposit [Member]    
Adjusted Cost 2,500 7,500
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value $ 2,500 $ 7,500