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Note 4 - Unconsolidated Investments (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Equity Method Investments [Table Text Block]
   
March 31,
   
December 31,
 
   
2017
   
2016
 
   
(Dollars in thousands)
 
Sarulla
  $
2,806
    $
(11,081
)