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Trade accounts receivable - net
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Trade accounts receivable - net
Note 3 - Trade accounts receivable – net
 
At December 31, 2017, 2016, and 2015 trade accounts receivable are net of reserves for doubtful accounts of $0.7 million, $0.4 million and $0.3 million, respectively. The following table represents the activity occurring in the reserves for doubtful accounts in 2017, 2016 and 2015.
 
(in thousands)
 
Beginning Balance
at January 1
 
Net additions charged to
Operations
 
Deductions 
and Other
 
Ending Balance
at December 31
 
2017
 
$
365
 
$
136
 
$
221
 
$
722
 
2016
 
$
335
 
$
21
 
$
9
 
$
365
 
2015
 
$
244
 
$
99
 
$
(8)
 
$
335