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Current Receivables (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Current receivables
Current receivables are comprised of the following at December 31:
 
2018
2017
Customer receivables
$
4,974

$
4,700

Related parties
653

801

Other
669

844

Total current receivables
6,296

6,345

Less: Allowance for doubtful accounts
(327
)
(330
)
Total current receivables, net
$
5,969

$
6,015

The change in allowance for doubtful accounts is as follows:
 
2018
2017
Balance at beginning of year
$
330

$
186

Additions
47

159

Amounts written off
(43
)
(23
)
Other
(7
)
8

Balance at end of year
$
327

$
330