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Note 8 - Commitments and Contingent Liabilities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
    (Dollars in thousands)
    September 30,
2017		   December 31,
2016
Standby Letters of Credit   $
49,889
     $
36,657
  
Performance Letters of Credit    
4,396
      
2,471
  
Construction Mortgages    
23,825
      
21,363
  
Personal Lines of Credit    
6,271
      
5,905
  
Overdraft Protection Lines    
6,183
      
5,680
  
Home Equity Lines of Credit    
15,799
      
14,722
  
Commercial Lines of Credit    
71,776
      
51,725
  
    $
178,139
     $
138,523