Note 2 - Investments - Realized Gains and Losses Related to the Sale of Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Gross gains	$ 24,720	$ 248,891
Gross losses	(133,363)	(18,899)
Realized gains (losses)	$ (108,643)	$ 229,992