Note 20 - Parent Company Only Condensed Financial Statements - Condensed Statements of Cash Flow Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Net Income	$ 9,807	$ 10,190
Discount Accretion and Premium Amortization, Net	3,551	3,919
Decrease (Increase) in Accrued Interest Receivable	138	(701)
Net Cash Provided By Operating Activities	28,428	8,855
Purchase of HTM Securities	(3,249)	(20,253)
Proceeds from Payments and Maturities of HTM Securities	31,039	24,762
Net Cash Used By Investing Activities	(26,675)	(58,485)
Proceeds from Employee Stock Purchase Plan	49	57
Purchases of Treasury Stock	(1,051)	(582)
Dividends to Preferred Stock Shareholders	(926)	0
Dividends to Common Stock Shareholders	(1,797)	(1,687)
Net Cash Provided By Financing Activities	48,240	149,412
Net Increase in Cash and Cash Equivalents	49,993	99,782
Cash and Cash Equivalents at Beginning of Year	128,284	28,502
Cash and Cash Equivalents at End of Year	178,277	128,284
Parent Company [Member]
Net Income	9,807	10,190
Equity in Earnings of Security Federal Bank	(8,620)	(9,595)
Discount Accretion and Premium Amortization, Net	13	(235)
Decrease (Increase) in Accrued Interest Receivable	78	(10)
Change in Accounts Receivable and Other Assets	11,085	(10,970)
Change in Accounts Payable and Other Liabilities	(299)	678
Net Cash Provided By Operating Activities	12,064	(9,942)
Purchase of HTM Securities	(5,031)	(2,934)
Proceeds from Payments and Maturities of HTM Securities	14,360	13,777
Investment in Subsidiary	0	(660)
Net Cash Used By Investing Activities	9,329	10,183
Repurchase of Subordinated Debentures	(16,500)	0
Proceeds from Employee Stock Purchase Plan	49	57
Purchases of Treasury Stock	(1,052)	(582)
Dividends to Preferred Stock Shareholders	(926)	0
Dividends to Common Stock Shareholders	(1,797)	(1,687)
Net Cash Provided By Financing Activities	(20,226)	(2,212)
Net Increase in Cash and Cash Equivalents	1,167	(1,971)
Cash and Cash Equivalents at Beginning of Year	26,842	28,813
Cash and Cash Equivalents at End of Year	$ 28,009	$ 26,842