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Note 8 - Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
Core
Deposit
Intangible
    
 
Accumulated
Amortization
    
Net
Core
Deposit
Intangible
  
                         
Core
Deposit
Intangible
  
 
 
 
  
 
 
 
  
 
 
 
Balance, December 31, 2015
   $
1,056,693
     $
(940,429
 )   $
116,264
  
                         
Amortization Expense
    
-
      
(35,749
 )    
(35,749
 )
                         
Balance, December 31, 2016
   $
1,056,693
     $
(976,178
 )   $
80,515
  
                         
Amortization Expense
  
 
-
   
 
(35,749
)
  
 
(35,749
)
                         
Balance,
December
31,
201
7
  
$
1,056,693
    
$
(1,011,927
)
  
$
44,766