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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Three months ended
September 30,
    
Nine Months Ended
September 30,
  
   
2020
    
2019
    
2020
    
2019
  
Foreign currency translation
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Balance at beginning of period
   $
(1,857
)
   $
(1,224
)
   $
(1,778
)
   $
(1,285
)
Other comprehensive loss:
                                
Foreign currency translation adjustments (1)
    
268
      
(337
)
    
189
 
    
(276
 )
Total accumulated other comprehensive loss
   $
(1,589
)
   $
(1,561
)
   $
(1,589
)
   $
(1,561
)