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Note 6 - Accumulated Loss of Unconsolidated Company in Excess of Investment (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Equity Method Investments [Table Text Block]
   
December 31,
 
   
2016
   
2015
 
   
(Dollars in thousands)
 
Sarulla
  $
(11,081
)   $
(8,100
)