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Note 9 - Revenue from Contracts with Customers (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    2018   2017
         
Service charges on deposit accounts   $
1,109
    $
1,001
 
Investment advisory income    
88
     
114
 
Revenue from contracts with customers    
1,197
     
1,115
 
                 
Gain on sale of loans and securities    
241
     
257
 
Increase in cash value of life insurance    
43
     
41
 
Other    
45
     
40
 
Other noninterest income    
329
     
338
 
                 
Total noninterest income   $
1,526
    $
1,453