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Note 6 - Securities Sold Under Agreements to Repurchase (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   
Nine Months Ended
September
30,
201
7
   
Twelve
Months Ended
December 31, 201
6
 
                 
Outstanding balance at end of period
  $
122,280,000
    $
131,710,000
 
Average interest rate at end of period
   
0.16
%
   
0.16
%
                 
Average daily balance during the period
  $
116,947,000
    $
149,079,000
 
Average interest rate
during the period
   
0.16
%
   
0.14
%
                 
Maximum daily balance during the period
  $
142,459,000
    $
175,088,000