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Note 21 - Revenue From Contracts With Customers (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
(In thousands)   2018   2017   2016
             
Service charges on deposit accounts   $
2,177
     $
2,098
     $
1,764
  
ATM and debit card fees    
2,564
      
2,329
      
2,197
  
Investment advisory income    
386
      
416
      
384
  
Other    
128
      
123
      
118
  
Revenue from contracts with customers    
5,255
      
4,966
      
4,463
  
                         
Net gains on loans and investments    
528
      
1,439
      
1,355
  
Increase in cash value of life insurance    
227
      
197
      
184
  
Other    
158
      
96
      
167
  
Other noninterest income    
913
      
1,732
      
1,706
  
                         
Total noninterest income   $
6,168
     $
6,698
     $
6,169
  
                         
Net gain (loss) on sales of foreclosed real estate   $
23
     $
(3
 )   $
(30
 )