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Trade accounts receivable - net
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Trade accounts receivable - net
Note 3 - Trade accounts receivable – net
 
At December 31, 2018, 2017, and 2016 trade accounts receivable are net of reserves for doubtful accounts of $1.2 million, $0.7 million and $0.4 million, respectively. The following table represents the activity occurring in the reserves for doubtful accounts in 2018, 2017 and 2016.
 
(in thousands)
 
Beginning

Balance

at January 1
 
 
Net additions

charged to

Operations
 
 
Deductions

and Other
 
 
Ending Balance

at December 31
 
2018
 
$
722
 
 
$
479
 
 
$
(23
)
 
$
1,178
 
2017
 
$
365
 
 
$
136
 
 
$
221
 
 
$
722
 
2016
 
$
335
 
 
$
21
 
 
$
9
 
 
$
365