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Note 10 - Securities Sold Under Agreements to Repurchase (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Short-term Debt [Table Text Block]
(Dollars in thousands)
 
2017
   
2016
 
                 
Average balance during the year
  $
70,187
    $
62,670
 
Average interest rate during the year
   
0.19
%    
0.22
%
Maximum month-end balance during the year
  $
75,365
    $
72,029