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Note 4 - Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block]
   
Three months ended
    
Nine months ended
  
   
September 30,
    
September 30,
  
(In thousands)
  
2018
    
2017
    
2018
    
2017
  
Balance at beginning of period
   $
898
     $
869
     $
875
     $
921
  
Additions for mortgage loans sold
    
125
      
50
      
220
      
143
  
Amortization
    
(40
 )    
(77
 )    
(112
 )    
(222
 )
Balance at end of period
   $
983
     $
842
     $
983
     $
842