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Note 10 - Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
                 
   
Three Months Ended
  
   
March 31,
  
(in thousands)
  
2019
    
2018
  
Foreign currency translation adjustments
                
Balance at beginning of period
   $
(8,492
 )   $
(5,234
 )
Other comprehensive income before reclassifications
    
476
      
2,393
  
Amounts reclassified from accumulated other comprehensive income
    
-
      
-
  
Net current-period other comprehensive income
    
476
      
2,393
  
Balance at end of period
   $
(8,016
 )   $
(2,841
 )