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Note 9 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   
2017
    
2016
  
                 
Outstanding balance at year-end
   $
118,748,000
     $
131,710,000
  
Weighted average interest rate at year-end
    
0.16
%
    
0.16
%
                 
Average daily balance during the year
   $
116,587,000
     $
149,079,000
  
Weighted average interest rate during the year
    
0.16
%
    
0.14
%
                 
Maximum daily balance during the year
   $
142,459,000
     $
175,088,000