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Note 4 - Unconsolidated Investments (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Equity Method Investments [Table Text Block]
   
September 30,
   
December 31,
 
   
2017
   
2016
 
   
(Dollars in thousands)
 
Sarulla
  $
25,367
    $
(11,081
)