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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue Recognition [Abstract]  
Schedule of Loss Contingencies by Contingency [Table Text Block]
Notes 2 - Revenue Recognition (continued)

Sales returns and allowances accrual activity is shown below:

 
 
Years Ended December 31,
 
 
 
2018
  
2017
  
2016
 
Beginning balance
 
$
36,680
  
$
34,479
  
$
32,487
 
Sales allowances
  
102,026
   
89,009
   
86,896
 
Credits issued
  
(95,521
)
  
(87,403
)
  
(85,341
)
Foreign currency
  
(522
)
  
595
   
437
 
Ending balance
 
$
42,663
  
$
36,680
  
$
34,479