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Note 3 - Investments (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) $ 0 $ 0
Investments 985,730 0
US Treasury Bill Securities [Member]    
Investments $ 986,000 $ 0