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Note 3 - Cash and Balances Due From Banks (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Cash, Cash Equivalents and Investments [Table Text Block]
   
20
1
8
    
2017
  
                 
Cash on Hand and Cash Items
  
$
9,359,924
     $
9,746,132
  
Noninterest-Bearing Deposits with Other Banks
  
 
1,016,952
      
13,399,004
  
                 
   
$
10,376,876
     $
23,145,136