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Note 14 - Regulatory Matters & Subsequent Event (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
   
FNCB Bank
    
Minimum Required For Capital Adequacy Purposes
    
Minimum Required For Capital Adequacy Purposes with Conservation Buffer
    
Minimum Required To Be Well Capitalized Under Prompt Corrective Action Regulations
  
(dollars in thousands)
  
Amount
    
Ratio
    
Ratio
    
Ratio
    
Ratio
  
December 31, 2019
                                        
                                         
Total capital (to risk-weighted assets)
   $
133,406
      
14.77
%
    
8.00
%
    
10.50
%
    
10.00
%
                                         
Tier I capital (to risk-weighted assets)
    
123,753
      
13.70
%
    
6.00
%
    
8.50
%
    
8.00
%
                                         
Tier I common equity (to risk-weighted assets)
    
123,753
      
13.70
%
    
4.50
%
    
7.00
%
    
6.50
%
                                         
Tier I capital (to average assets)
    
123,753
      
10.36
%
    
4.00
%
    
4.000
%
    
5.00
%
                                         
Total risk-weighted assets
    
903,172
      
 
      
 
      
 
      
 
  
                                         
Total average assets
    
1,194,789
      
 
      
 
      
 
      
 
  
   
FNCB Bank
    
Minimum Required For Capital Adequacy Purposes
    
Minimum Required For Capital Adequacy Purposes with Conservation Buffer
    
Minimum Required To Be Well Capitalized Under Prompt Corrective Action Regulations
  
(dollars in thousands)
  
Amount
    
Ratio
    
Ratio
    
Ratio
    
Ratio
  
December 31, 2018
                                        
                                         
Total capital (to risk-weighted assets)
   $
112,128
      
12.17
%
    
8.00
%
    
9.875
%
    
10.00
%
                                         
Tier I capital (to risk-weighted assets)
    
102,354
      
11.11
%
    
6.00
%
    
7.875
%
    
8.00
%
                                         
Tier I common equity (to risk-weighted assets)
    
102,354
      
11.11
%
    
4.50
%
    
6.375
%
    
6.50
%
                                         
Tier I capital (to average assets)
    
102,354
      
8.27
%
    
4.00
%
    
4.00
%
    
5.00
%
                                         
Total risk-weighted assets
    
921,126
      
 
      
 
      
 
      
 
  
                                         
Total average assets
    
1,238,347