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Note 16 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(in thousands)
  
As of March 31,
    
As of December 31,
  
   
2019
    
2018
  
Foreign currency translation adjustment
   $
(4,304
)
   $
(4,396
)
                 
Accumulated other comprehensive loss
   $
(4,304
)
   $
(4,396
)