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Receivables (Tables)
 6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables consist of the following:
 
June 30, 2019
 
December 31, 2018
Trade receivables
$
139

 
$
87

Income tax receivable
24

 
16

Other receivables
16

 
25

Allowance for doubtful accounts
(2
)
 
(1
)
Total
$
177

 
$
128