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Note 14 - Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
    (Dollars in thousands)
    2018   2017
Standby Letters of Credit   $
37,559
     $
55,105
  
Performance Letters of Credit    
3,544
      
4,339
  
Construction Mortgages    
56,691
      
30,619
  
Personal Lines of Credit    
6,186
      
6,183
  
Overdraft Protection Lines    
6,140
      
6,167
  
Home Equity Lines of Credit    
21,520
      
16,337
  
Commercial Lines of Credit    
74,602
      
62,088
  
    $
206,242
     $
180,838