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Note 15 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
                         
   
Year Ended December 31,
  
(in thousands)
  
2018
    
2017
    
2016
  
                         
Foreign currency translation adjustments
                        
Balance at beginning of period
   $
(5,234
 )   $
(10,753
 )   $
(5,212
 )
Other comprehensive (loss) income before reclassifications
    
(3,258
 )    
5,519
      
(5,541
 )
Amounts reclassified from accumulated other comprehensive income (loss)
    
-
      
-
      
-
  
Net current-period other comprehensive (loss) income
    
(3,258
 )    
5,519
      
(5,541
 )
Balance at end of period
   $
(8,492
 )   $
(5,234
 )   $
(10,753
 )