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Note 9 - Revenue From Contracts With Customers (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2019   2018   2019   2018
    (In thousands)
                 
Service charges on deposit accounts   $
516
     $
545
     $
977
     $
1,054
  
ATM and debit card fees    
729
      
643
      
1,376
      
1,243
  
Investment advisory income    
146
      
130
      
244
      
218
  
Other    
33
      
33
      
67
      
68
  
Revenue from contracts with customers    
1,424
      
1,351
      
2,664
      
2,583
  
                                 
Net gains on loans and investments    
246
      
194
      
438
      
435
  
Increase in cash value of life insurance    
70
      
85
      
118
      
128
  
Other    
28
      
106
      
53
      
116
  
Other noninterest income    
344
      
385
      
609
      
679
  
                                 
Total noninterest income   $
1,768
     $
1,736
     $
3,273
     $
3,262