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Note 9 - Marketable Securities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Proceeds from Sale and Maturity of Marketable Securities     $ 775,000 $ 5,255,145
Debt and Equity Securities, Realized Gain (Loss) $ 0 $ 433,769 $ 0 $ 433,769