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Note 15 - Shareholders' Equity and Regulatory Matters - (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
                                   
To Be Well
  
                                   
Capitalized Under
  
     
 
      
 
    
For Capital
    
Prompt Corrective
  
Business First Bancshares, Inc. (Consolidated)
  
Actual
    
Adequacy Purposes
    
Action Provisions
  
   
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
  
 
  
(Dollars in thousands)
  
December 31, 2019:
                                                
                                                 
Total Capital (to Risk-Weighted Assets)
   $
264,495
      
13.30
 %   $
159,120
      
8.00
 %    
N/A
      
N/A
  
Tier I Capital (to Risk-Weighted Assets)
   $
227,265
      
11.43
 %   $
119,340
      
6.00
 %    
N/A
      
N/A
  
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
227,265
      
11.43
 %   $
89,505
      
4.50
 %    
N/A
      
N/A
  
Tier I Leveraged Capital (to Average Assets)
   $
227,265
      
10.56
 %   $
86,058
      
4.00
 %    
N/A
      
N/A
  
                                                 
December 31, 2018:
                                                
                                                 
Total Capital (to Risk-Weighted Assets)
   $
242,144
      
13.91
 %   $
139,237
      
8.00
 %    
N/A
      
N/A
  
Tier I Capital (to Risk-Weighted Assets)
   $
205,924
      
11.83
 %   $
104,428
      
6.00
 %    
N/A
      
N/A
  
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
205,924
      
11.83
 %   $
78,321
      
4.50
 %    
N/A
      
N/A
  
Tier I Leveraged Capital (to Average Assets)
   $
205,924
      
11.66
 %   $
70,641
      
4.00
 %    
N/A
      
N/A
  
                                   
To Be Well
  
                                   
Capitalized Under
  
     
 
      
 
    
For Capital
    
Prompt Corrective
  
b1BANK
  
Actual
    
Adequacy Purposes
    
Action Provisions
  
   
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
  
 
  
(Dollars in thousands)
  
December 31, 2019:
                                                
                                                 
Total Capital (to Risk-Weighted Assets)
   $
254,520
      
12.80
 %   $
159,033
      
8.00
 %   $
198,791
      
10.00
 %
Tier I Capital (to Risk-Weighted Assets)
   $
242,290
      
12.19
 %   $
119,275
      
6.00
 %   $
159,033
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
242,290
      
12.19
 %   $
89,456
      
4.50
 %   $
129,214
      
6.50
 %
Tier I Leveraged Capital (to Average Assets)
   $
242,290
      
11.27
 %   $
86,015
      
4.00
 %   $
107,518
      
5.00
 %
                                                 
December 31, 2018:
                                                
                                                 
Total Capital (to Risk-Weighted Assets)
   $
224,356
      
12.90
 %   $
139,126
      
8.00
 %   $
173,908
      
10.00
 %
Tier I Capital (to Risk-Weighted Assets)
   $
213,136
      
12.26
 %   $
104,345
      
6.00
 %   $
139,126
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
213,136
      
12.26
 %   $
78,259
      
4.50
 %   $
113,040
      
6.50
 %
Tier I Leveraged Capital (to Average Assets)
   $
213,136
      
12.08
 %   $
70,592
      
4.00
 %   $
88,241
      
5.00
 %