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Note 2 - Cash and Balances Due From Banks (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Cash, Cash Equivalents and Investments [Table Text Block]
   
20
1
7
    
20
16
  
                 
Cash
on Hand and Cash Items
  
$
9,746,132
     $
8,509,530
  
Noninterest-Bearing
Deposits with Other Banks
  
 
13,399,004
      
20,312,574
  
                 
   
$
23,145,136
     $
28,822,104