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Note 6 - Securities Sold Under Agreements to Repurchase (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   
Six Months
Ended
June 30,
2017
    
Twelve Months
Ended
December 31,
2016
  
                 
Outstanding balance at end of period
   $
110,920,000
     $
131,710,000
  
Average interest rate at end of period
    
0.17
%
    
0.16
%
                 
Average daily balance during the period
   $
121,823,000
     $
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