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Note 9 - Marketable Securities - Net Gains and Losses on Marketable Securities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net (losses) gains recognized during the period on marketable securities $ (9,501) $ 7,479 $ 31,995 $ 80,180
Less: Net losses recognized during the period on marketable securities sold during the period 0 (433,769) 0 (433,769)
Unrealized (losses) gains recognized during the reporting period on marketable securities still held at the reporting date $ (9,501) $ 441,248 $ 31,995 $ 513,949