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Note 9 - Goodwill and Core Deposit Intangible - Net (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
 
 
2016
 
 
2015
 
 
2014
 
                         
Balance—beginning of period
   $
11,374
     $
7,338
     $
--
  
                         
FNSC acquisition
    
--
      
--
      
7,677
  
Metropolitan acquisition
    
--
      
4,760
      
--
  
Amortization expense
   
(1,021
 )    
(724
 )    
(339
 )
                         
Balance—end of period
   $
10,353
     $
11,374
     $
7,338