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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2021
    
2020
  
Foreign currency translation
      
 
      
 
Balance at beginning of period
   $
(1,370
 )   $
(1,778
 )
Other comprehensive loss:
                
Foreign currency translation adjustments (1)
    
(193
 )    
(231
 )
Total accumulated other comprehensive loss
   $
(1,563
 )   $
(2,009
 )