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Note 9 - Revenue From Contracts With Customers (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended   Nine Months Ended
   
September 30,
  
September 30,
   
2019
  
2018
  
2019
  
2018
    (In thousands)
                 
Service charges on deposit accounts   $
560
     $
557
     $
1,537
     $
1,611
  
ATM and debit card fees    
743
      
641
      
2,119
      
1,884
  
Investment advisory income    
118
      
84
      
362
      
302
  
Other    
28
      
29
      
96
      
97
  
Revenue from contracts with customers    
1,449
      
1,311
      
4,114
      
3,894
  
                                 
Net gains on loans and investments    
309
      
320
      
747
      
755
  
Increase in cash value of life insurance    
47
      
51
      
165
      
179
  
Other    
28
      
16
      
80
      
132
  
Other noninterest income    
384
      
387
      
992
      
1,066
  
                                 
Total noninterest income   $
1,833
     $
1,698
     $
5,106
     $
4,960