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Note 20 - Guarantees, Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
December 31,
 
   
2017
   
2016
 
   
(Dollars in Thousands)
 
Standby letters of credit
  $
180
    $
183
 
Commitments to extend credit
  $
55,801
    $
41,267