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Note 10 - Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(in thousands)
  
2018
    
2017
    
2018
    
2017
  
Foreign currency translation adjustments
                                
Balance at beginning of period
   $
(6,359
 )   $
(7,404
 )   $
(5,234
 )   $
(10,753
 )
Other comprehensive income (loss) before reclassifications
    
(879
 )    
1,655
      
(2,004
 )    
5,004
  
Amounts reclassified from accumulated other comprehensive loss
    
-
      
-
      
-
      
-
  
Net current-period other comprehensive income (loss)
    
(879
 )    
1,655
      
(2,004
 )    
5,004
  
Balance at end of period
   $
(7,238
 )   $
(5,749
 )   $
(7,238
 )   $
(5,749
 )