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Note 8 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Securities Financing Transactions [Table Text Block]
   
2019
    
2018
  
Average daily balance during the year
   $
11,485,000
     $
9,123,000
  
Average interest rate during the year
    
0.11
 %    
0.09
 %
Maximum month-end balance during the year
   $
16,013,000
     $
13,706,000
  
Weighted average interest rate at year-end
    
0.12
 %    
0.11
 %