Note 7 - Investments in Equity Securities (Details Textual) - USD ($)	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Equity Securities, FV-NI, Current	$ 86,608	$ 776,453	$ 665,301	$ 657,971
Proceeds from Sale of Equity Securities, FV-NI	$ 199,228
Equity Securities, FV-NI, Realized Gain (Loss)		$ 0

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
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-Section S99
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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

+ References

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