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Note 9 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   
2018
    
2017
  
                 
Outstanding balance at year-end
   $
103,519,000
     $
118,748,000
  
Weighted average interest rate at year-end
    
0.26
%
    
0.16
%
                 
Average daily balance during the year
   $
101,005,000
     $
116,587,000
  
Weighted average interest rate during the year
    
0.24
%
    
0.16
%
                 
Maximum daily balance during the year
   $
123,046,000
     $
142,459,000