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Note 8 - Federal Funds Purchased and Other Short-term Borrowings (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Short-term Debt [Table Text Block]
December 31, (Dollars in thousands)
  
2016
    
2015
  
Federal funds purchased and short-term securities sold under agreements to repurchase
   $
35,085
     $
34,353
  
Total short-term
   $
35,085
     $
34,353
  
                 
Average balance during the year
   $
36,919
     $
31,580
  
Maximum month-end balance during the year
    
41,397
      
39,474
  
Average interest rate during the year
    
.27
 %    
.16
 %
Average interest rate at year-end
    
.35
      
.24