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Note 9 - Goodwill and Core Deposit Intangible - Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
201
7
    
2016
    
2015
  
                         
Balance
—beginning of period
   $
10,353
     $
11,374
     $
7,338
  
                         
Metropolitan acquisition
    
--
      
--
      
4,760
  
Amortization expense
    
(1,021
 )    
(1,021
 )    
(724
 )
                         
Balance
—end of period
   $
9,332
     $
10,353
     $
11,374