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Note 15 - Stockholders' Equity and Regulatory Matters - Actual Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total Capital, Amount $ 264,495 $ 242,144
Total Capital to Risk-Weighted Assets Ratio 13.30% 13.91%
Total Capital Required for Capital Adequacy, Amount $ 159,120 $ 139,237
Total Capital Required for Capital Adequacy, Ratio 8.00% 8.00%
Tier I Capital, Amount $ 227,265 $ 205,924
Tier I Capital to Risk-Weighted Assets Ratio 11.43% 11.83%
Tier I Capital Required for Capital Adequacy, Amount $ 119,340 $ 104,428
Tier I Capital Required for Capital Adequacy, Ratio 6.00% 6.00%
Common Equity Tier 1 Capital, Amount $ 227,265 $ 205,924
Common Equity Tier 1 Capital to Risk-Weighted Assets Ratio 11.43% 11.83%
Common Equity Tier 1 Capital Required for Capital Adequacy, Amount $ 89,505 $ 78,321
Common Equity Tier 1 Capital Required for Capital Adequacy, Ratio 4.50% 4.50%
Tier I Leveraged Capital, Amount $ 227,265 $ 205,924
Tier I Leveraged Capital to Average Assets Ratio 10.56% 11.66%
Tier I Leveraged Capital Required for Capital Adequacy, Amount $ 86,058 $ 70,641
Tier I Leveraged Capital Capital Required for Capital Adequacy, Ratio 4.00% 4.00%
Business First Bank [Member]    
Total Capital, Amount $ 254,520 $ 224,356
Total Capital to Risk-Weighted Assets Ratio 12.80% 12.90%
Total Capital Required for Capital Adequacy, Amount $ 159,033 $ 139,126
Total Capital Required for Capital Adequacy, Ratio 8.00% 8.00%
Tier I Capital, Amount $ 242,290 $ 213,136
Tier I Capital to Risk-Weighted Assets Ratio 12.19% 12.26%
Tier I Capital Required for Capital Adequacy, Amount $ 119,275 $ 104,345
Tier I Capital Required for Capital Adequacy, Ratio 6.00% 6.00%
Common Equity Tier 1 Capital, Amount $ 242,290 $ 213,136
Common Equity Tier 1 Capital to Risk-Weighted Assets Ratio 12.19% 12.26%
Common Equity Tier 1 Capital Required for Capital Adequacy, Amount $ 89,456 $ 78,259
Common Equity Tier 1 Capital Required for Capital Adequacy, Ratio 4.50% 4.50%
Tier I Leveraged Capital, Amount $ 242,290 $ 213,136
Tier I Leveraged Capital to Average Assets Ratio 11.27% 12.08%
Tier I Leveraged Capital Required for Capital Adequacy, Amount $ 86,015 $ 70,592
Tier I Leveraged Capital Capital Required for Capital Adequacy, Ratio 4.00% 4.00%
Total Capital to be Well Capitalized, Amount $ 198,791 $ 173,908
Total Capital to be Well Capitalized, Ratio 10.00% 10.00%
Tier I Capital to be Well Capitalized, Amount $ 159,033 $ 139,126
Tier I Capital to be Well Capitalized, Ratio 8.00% 8.00%
Common Equity Tier 1 Capital to be Well Capitalized, Amount $ 129,214 $ 113,040
Common Equity Tier 1 Capital to be Well Capitalized, Ratio 6.50% 6.50%
Tier I Leveraged Capital to be Well Capitalized, Amount $ 107,518 $ 88,241
Tier I Leveraged Capital to be Well Capitalized, Ratio 5.00% 5.00%