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Note 14 - Financial Instruments With Off-balance Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
December
31,
  
   
20
17
    
20
16
  
Financial instruments whose contract amounts represent credit risk:
                
Commitments to extend credit
  
$
161,222
     $
130,252
  
Standby letters of credit
  
 
16,351
      
20,499
  
Mortgage loans sold with potential recourse
  
 
14,130
      
17,526