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Note 16 - Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
   
Year ended December 31,
  
   
2017
    
2016
    
2015
  
                         
Balance, beginning of year
   $
5,822,136
     $
3,946,621
     $
4,409,644
  
New Loans
    
1,523,847
      
3,112,689
      
-
  
Repayments
    
(817,050
 )    
(1,237,174
 )    
(463,023
 )
                         
Balance, end of year
   $
6,528,933
     $
5,822,136
     $
3,946,621