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Receivables (Tables)
 9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables consist of the following:
 
September 30, 2019
 
December 31, 2018
Trade receivables
$
140

 
$
87

Income tax receivable
27

 
16

Other receivables
19

 
25

Allowance for doubtful accounts
(3
)
 
(1
)
Total
$
183

 
$
128