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Note 4 - Investment in an Unconsolidated Company (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Equity Method Investments [Table Text Block]
   
June 30,
   
December 31,
 
   
2018
   
2017
 
   
(Dollars in thousands)
 
Sarulla
  $
66,551
    $
34,084