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Note 9 - Borrowings (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Federal Home Loan Bank, Advances [Table Text Block]
   
At December 31,
  
Maturity
  
2017
    
2016
  
Year one
  
$
35,000,000
    $
30,000,000
  
Year two
  
 
-
     
10,000,000
  
Year three
  
 
10,000,000
     
-
  
Year four
  
 
-
     
10,000,000    
  
                                                                                   Total  
$
45,000,000
    $
50,000,000