Note 12 - Regulatory Matters - Schedule of Regulatory Capital Requirements (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)	$ 162,254	$ 158,748
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets), Actual Ratio	0.189	0.187
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets), Capital Adequacy	$ 51,511	$ 50,913
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets) Capital Adequacy Ratio	0.06	0.06
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets), Well Capitalized	$ 68,681	$ 67,883
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets), Well Capitalized Ratio	0.08	0.08
Total Risk-Based Capital (To Risk Weighted Assets)	$ 173,035	$ 169,405
Total Risk-Based Capital (To Risk Weighted Assets), Actual Ratio	0.202	0.20
Total Risk-Based Capital (To Risk Weighted Assets), Capital Adequacy	$ 68,681	$ 67,883
Total Risk-Based Capital (To Risk Weighted Assets) Capital Adequacy Ratio	0.08	0.08
Total Risk-Based Capital (To Risk Weighted Assets), Well Capitalized	$ 85,851	$ 84,854
Total Risk-Based Capital (To Risk Weighted Assets), Well Capitalized Ratio	0.10	0.10
Common Equity Tier 1 Capital (To Risk Weighted Assets)	$ 162,254	$ 158,748
Common Equity Tier 1 Capital (To Risk Weighted Assets), Actual Ratio	0.189	0.187
Common Equity Tier 1 Capital (To Risk Weighted Assets), Capital Adequacy	$ 38,633	$ 38,184
Common Equity Tier 1 Capital (To Risk Weighted Assets) Capital Adequacy Ratio	0.045	0.045
Common Equity Tier 1 Capital (To Risk Weighted Assets), Well Capitalized	$ 55,803	$ 55,155
Common Equity Tier 1 Capital (To Risk Weighted Assets), Well Capitalized Ratio	0.065	0.065
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)	$ 162,254	$ 158,748
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets), Actual Ratio	0.106	0.099
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets), Capital Adequacy	$ 61,354	$ 64,277
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets) Capital Adequacy Ratio	0.04	0.04
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets), Well Capitalized	$ 76,693	$ 80,346
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets), Well Capitalized Ratio	0.05	0.05

SECURITY FEDERAL CORP 10-Q