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Note 3 - Financial Instruments - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Adjusted Cost $ 4,217 $ 9,293
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 4,217 9,293
Money Market Funds [Member]    
Adjusted Cost 4,217 1,793
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 4,217 1,793
Certificates of Deposit [Member]    
Adjusted Cost 0 7,500
Unrealized Gains 0 0
Unrealized Losses   0
Market Value $ 0 $ 7,500