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Note 6 - Accrued Interest Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accrued Interest Receivable [Table Text Block]
   
2019
   
2018
 
State and municipal securities
  $
111,607
    $
114,424
 
Residential mortgage-backed securities
   
32,907
     
38,805
 
Loans
   
730,590
     
671,313
 
    $
875,104
    $
824,542