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Note 12 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(In thousands)
  
As of December 31,
  
   
2018
    
2017
    
2016
  
Foreign currency translation adjustment
   $
(4,396
)
   $
(3,510
)
   $
(5,590
)
Accumulated other comprehensive loss
   $
(4,396
)
   $
(3,510
)
   $
(5,590
)