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Note 2 - Cash, Cash Equivalents, and Investments (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Securities, Held-to-maturity, Securities Purchased, Discount $ 31,357 $ 17,601 $ 61,472 $ 32,834  
Corporate Debt Securities [Member]          
Debt Securities, Held-to-maturity, Securities Purchased, Discount         $ 39,012