Note 2 - Investments - Realized Gains and Losses Related to the Sale of Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Gross gains	$ 188,777	$ 1,900
Gross losses	(3,692)	(2,541)
Realized gains (losses)	185,085	(641)
Decrease in allowance for credit losses	(13,225)	(0)
Net gains (losses) realized on the sale of securities and net credit losses recognized in operations	$ 198,310	$ (641)