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Note 15 - Stockholders' Equity and Regulatory Matters - Actual Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Total Capital, Amount $ 242,144 $ 181,565
Total Capital to Risk-Weighted Assets Ratio 13.91% 15.23%
Tier I Capital, Amount $ 205,924 $ 172,800
Tier I Capital to Risk-Weighted Assets Ratio 11.83% 14.49%
Common Equity Tier 1 Capital, Amount $ 205,924 $ 172,800
Common Equity Tier 1 Capital to Risk-Weighted Assets Ratio 11.83% 14.49%
Tier I Leveraged Capital, Amount $ 205,924 $ 172,800
Tier I Leveraged Capital to Average Assets Ratio 11.66% 13.53%
Business First Bank [Member]    
Total Capital, Amount $ 224,356 $ 120,806
Total Capital to Risk-Weighted Assets Ratio 12.90% 10.24%
Tier I Capital, Amount $ 213,136 $ 112,041
Tier I Capital to Risk-Weighted Assets Ratio 12.26% 9.50%
Common Equity Tier 1 Capital, Amount $ 213,136 $ 112,041
Common Equity Tier 1 Capital to Risk-Weighted Assets Ratio 12.26% 9.50%
Tier I Leveraged Capital, Amount $ 213,136 $ 112,041
Tier I Leveraged Capital to Average Assets Ratio 12.08% 8.78%
Total Capital Required for Capital Adequacy, Amount $ 139,126 $ 94,377
Total Capital Required for Capital Adequacy, Ratio 8.00% 8.00%
Total Capital to be Well Capitalized, Amount $ 173,908 $ 117,971
Total Capital to be Well Capitalized, Ratio 10.00% 10.00%
Tier I Capital Required for Capital Adequacy, Amount $ 104,345 $ 70,783
Tier I Capital Required for Capital Adequacy, Ratio 6.00% 6.00%
Tier I Capital to be Well Capitalized, Amount $ 139,126 $ 94,377
Tier I Capital to be Well Capitalized, Ratio 8.00% 8.00%
Common Equity Tier 1 Capital Required for Capital Adequacy, Amount $ 78,259 $ 53,087
Common Equity Tier 1 Capital Required for Capital Adequacy, Ratio 4.50% 4.50%
Common Equity Tier 1 Capital to be Well Capitalized, Amount $ 113,040 $ 76,681
Common Equity Tier 1 Capital to be Well Capitalized, Ratio 6.50% 6.50%
Tier I Leveraged Capital Required for Capital Adequacy, Amount $ 70,592 $ 51,040
Tier I Leveraged Capital Capital Required for Capital Adequacy, Ratio 4.00% 4.00%
Tier I Leveraged Capital to be Well Capitalized, Amount $ 88,241 $ 63,800
Tier I Leveraged Capital to be Well Capitalized, Ratio 5.00% 5.00%