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Note 21 - Employee Benefit Plan (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Expected Benefit Payments [Table Text Block]
 
 
 
(Dollars in
thousands)
 
Year ending December 31
:
   
 
 
 
2018
    $
4,258
 
2019
     
1,803
 
2020
     
1,242
 
2021
     
1,418
 
2022
     
2,112
 
2023-2027      
4,338
 
      $
15,171