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Note 9 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   
2016
    
2015
  
                 
Outstanding balance at year-end
   $
131,710,000
     $
154,771,000
  
Weighted average interest rate at year-end
    
0.16
%
    
0.11
%
                 
Average daily balance during the year
   $
149,079,000
     $
146,826,000
  
Weighted average interest rate during the year
    
0.14
%
    
0.11
%
                 
Maximum daily balance during the year
   $
175,088,000
     $
168,211,000