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Note 20 - Transactions With Related Entities (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
   
Year Ended December 31,
 
   
2017
   
2016
   
2015
 
   
(Dollars in thousands)
 
Property rental fee expense paid to the Parent
  $
    $
    $
303
 
Corporate financial, administrative, executive services, and research and development services provided to the Parent
  $
    $
    $
148
 
Services rendered by an indirect shareholder of the Parent
  $
    $
    $
15