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Note 10 - Securities Sold Under Agreements to Repurchase (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Short-term Debt [Table Text Block]
(Dollars in thousands)
 
2018
   
2017
 
                 
Average balance during the year
  $
62,580
    $
70,187
 
Average interest rate during the year
   
0.25
%    
0.19
%
Maximum month-end balance during the year
  $
74,725
    $
75,365