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Allowance for Doubtful Accounts, Sales Returns and Discounts
 12 Months Ended
Dec. 31, 2017
Allowance For Doubtful Accounts Sales Returns And Discounts [Abstract]  
Allowance For Doubtful Accounts Sales Returns and Discounts [Text Block]
Note 5.
Allowance for Doubtful Accounts, Sales Returns and Discounts
 
The activity in the allowance for doubtful accounts, sales returns and discounts for the years ended December 31, 2015, 2016 and 2017 is as follows:
 
Allowance for doubtful accounts
 
Period
 
Balance at 
beginning 
of year
 
Charges to
earnings
 
Amounts 
utilized
 
Balance at
end
of year
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year 2015
 
$
727
 
 
310
 
 
(262)
 
 
775
 
Year 2016
 
$
775
 
 
620
 
 
-
 
 
1,395
 
Year 2017
 
$
1,395
 
 
155
 
 
(1,550)
 
 
-
 
 
Allowance for sales returns and discounts
 
Period
 
Balance at 
beginning 
of year
 
Charges to
earnings
 
Amounts
utilized
 
Balance at
end
of year
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year 2015
 
$
868
 
 
8,887
 
 
(8,982)
 
 
773
 
Year 2016
 
$
773
 
 
10,624
 
 
(9,861)
 
 
1,536
 
Year 2017
 
$
1,536
 
 
8,720
 
 
(9,053)
 
 
1,203