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Note 10 - Accumulated Other Comprehensive Loss (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
       
   
Three Months Ended
 
   
March 31,
 
(in thousands)
 
2018
   
2017
 
Foreign currency translation adjustments
               
Balance at beginning of period
  $
(5,234
)   $
(10,753
)
Other comprehensive income (loss) before reclassifications
   
2,393
     
1,185
 
Amounts reclassified from accumulated other comprehensive loss
   
-
     
-
 
Net current-period other comprehensive income (loss)
   
2,393
     
1,185
 
Balance at end of period
  $
(2,841
)   $
(9,568
)