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Note 5 - Financial Instruments With Off-balance-sheet Risk (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
September 30, 2019
   
December 31, 2018
 
                 
Commitments to originate and sell mortgage loans
 
$
-
    $
34,268,309
 
Commitments to extend credit
 
 
24,940,030
     
25,323,822
 
Unused lines of credit
 
 
20,367,632
     
18,281,453
 
Totals
 
$
45,307,662
    $
77,873,584