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Trade accounts receivable - net
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Trade accounts receivable - net
Note 3 - Trade accounts receivable - net
 
At December 31, 2016, 2015, and 2014 trade accounts receivable are net of reserves for doubtful accounts of $0.4 million, $0.3 million and $0.2 million, respectively. The following table represents the activity occurring in the reserves for doubtful accounts in 2016, 2015 and 2014.
 
 
 
Beginning Balance
 
Net additions charged to
 
Deductions and Other
 
Ending Balance
 
(in thousands)
 
at January 1
 
Operations
 
(1)
 
at December 31
 
2016
 
$
335
 
$
21
 
$
9
 
$
365
 
2015
 
$
244
 
$
99
 
$
(8)
 
$
335
 
2014
 
$
227
 
$
31
 
$
(14)
 
$
244
 
 
(1)
2016 includes a reclassification adjustment not affecting operations