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Note 2 - Cash, Cash Equivalents, and Investments (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Securities, Held-to-maturity, Securities Purchased, Discount $ 1,547 $ 15,233  
Corporate Debt Securities [Member]      
Debt Securities, Held-to-maturity, Securities Purchased, Discount     $ 39,012