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Note 6 - Securities Sold Under Agreements to Repurchase (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   
Nine Months
Ended
September 30,
2019
    
Twelve Months
Ended
December 31,
2018
  
                 
Outstanding balance at end of period
   $
103,990,000
     $
103,519,000
  
Average interest rate at end of period
    
0.21
%
    
0.26
%
                 
Average daily balance during the period
   $
106,396,000
     $
101,005,000
  
Average interest rate during the period
    
0.25
%
    
0.24
%
                 
Maximum daily balance during the period
   $
133,411,000
     $
123,046,000