Note 2 - Investments - Realized Gains and Losses Related to the Sale of Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gross gains	$ 6,064	$ 188,777
Gross losses	(41,962)	(3,692)
Realized gains (losses)	(35,898)	185,085
Decrease in allowance for credit losses	(0)	(13,225)
Real Estate Loan [Member]
Decrease in allowance for credit losses	$ (0)	$ (13,225)