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Note 9 - Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
(in thousands)
  
2017
    
2016
    
2017
    
2016
  
Foreign currency translation adjustments
                                
Balance at beginning of period
   $
(9,568
 )   $
(4,468
 )   $
(10,753
 )   $
(5,212
 )
Other comprehensive income (loss) before reclassifications
    
2,164
      
(2,144
 )    
3,349
      
(1,400
 )
Amounts reclassified from accumulated other comprehensive income
    
-
      
-
      
-
      
-
  
Net current-period other comprehensive income (loss)
    
2,164
      
(2,144
 )    
3,349
      
(1,400
 )
Balance at end of period
   $
(7,404
 )   $
(6,612
 )   $
(7,404
 )   $
(6,612
 )