Note 2 - Investments - Schedule of Investment Gains (Losses) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Realized gains (losses) on sales of investments	$ (9,056)	$ (263,968)	$ (44,954)	$ (78,883)
Change in allowance for credit losses recognized in earnings	(125,700)	102,537	(125,700)	115,762
Unrealized net gains (losses) recognized in earnings	490,778	110,318	587,099	356,444
Change in value of embedded derivative	16,286	594,487	96,215	497,153
Debt and Equity Securities, Gain (Loss)	$ 372,308	$ 543,374	$ 512,660	$ 890,476