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Note 10 - Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block]
   
2017
    
2016
  
   
(Dollars in Thousands)
  
Balance at year-end
   $
10,000
     $
15,000
  
Average balance during the year
    
11,452
      
12,404
  
Maximum month-end balance during the year
    
15,000
      
15,000
  
Average rate paid during the year
    
1.55
%
    
0.71
%
Weighted average remaining
maturity (in years)
    
0.83 years
      
0.67 years