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Note 9 - Revenue From Contracts With Customers (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended
June 30,
  Six Months Ended
June 30,
    2018   2017   2018   2017
    (In thousands)
                 
Service charges on deposit accounts   $
1,188
    $
1,132
    $
2,297
    $
2,133
 
Investment advisory income    
130
     
131
     
218
     
245
 
Revenue from contracts with customers    
1,318
     
1,263
     
2,515
     
2,378
 
                                 
Gain on sale of loans and securities    
194
     
415
     
435
     
672
 
Increase in cash value of life insurance    
85
     
72
     
128
     
113
 
Other    
139
     
106
     
184
     
146
 
Other noninterest income    
418
     
593
     
747
     
931
 
                                 
Total noninterest income   $
1,736
    $
1,856
    $
3,262
    $
3,309