Note 20 - Parent Company Only Condensed Financial Statements - Condensed Statements of Income Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investment Securities Interest Income	$ 64,977	$ 42,578
Miscellaneous Income	9,390	9,612
Interest Expense	25,729	5,028
Provision For Income Taxes	2,288	2,709
Net Income	10,190	10,228
Parent Company [Member]
Equity in Earnings of Security Federal Bank	9,595	10,668
Investment Securities Interest Income	2,574	1,226
Miscellaneous Income	0	16
Total Income	12,169	11,910
Interest Expense	1,755	1,732
Other Expenses	65	65
Total Expenses	1,820	1,797
Income Before Income Taxes	10,349	10,113
Provision For Income Taxes	159	(115)
Net Income	$ 10,190	$ 10,228