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Note 3 - Financial Instruments - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Adjusted Cost $ 7,219 $ 9,293
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 7,219 9,293
Money Market Funds [Member]    
Adjusted Cost 2,219 1,793
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 2,219 1,793
Certificates of Deposit [Member]    
Adjusted Cost 5,000 7,500
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value $ 5,000 $ 7,500